From 48195fade2465d85a4ee03ac04429f32360b9ef0 Mon Sep 17 00:00:00 2001
From: Sicheng Song <sicheng.song@outlook.com>
Date: Thu, 18 May 2023 22:02:46 +0000
Subject: [PATCH 1/4] fix Jenkins CI pipeline for OS 3.0 version bump

Signed-off-by: Sicheng Song <sicheng.song@outlook.com>
---
 .../ml/client/MachineLearningClient.class       | Bin 0 -> 5901 bytes
 .../ml/client/MachineLearningNodeClient.class   | Bin 0 -> 19056 bytes
 .../org/opensearch/ml/client/package-info.class | Bin 0 -> 130 bytes
 .../org.mockito.plugins.MockMaker               |   1 +
 .../ml/client/MachineLearningClientTest$1.class | Bin 0 -> 5245 bytes
 .../ml/client/MachineLearningClientTest.class   | Bin 0 -> 8143 bytes
 .../client/MachineLearningNodeClientTest.class  | Bin 0 -> 27764 bytes
 client/build.gradle                             |   2 ++
 8 files changed, 3 insertions(+)
 create mode 100644 client/bin/main/org/opensearch/ml/client/MachineLearningClient.class
 create mode 100644 client/bin/main/org/opensearch/ml/client/MachineLearningNodeClient.class
 create mode 100644 client/bin/main/org/opensearch/ml/client/package-info.class
 create mode 100644 client/bin/test/mockito-extensions/org.mockito.plugins.MockMaker
 create mode 100644 client/bin/test/org/opensearch/ml/client/MachineLearningClientTest$1.class
 create mode 100644 client/bin/test/org/opensearch/ml/client/MachineLearningClientTest.class
 create mode 100644 client/bin/test/org/opensearch/ml/client/MachineLearningNodeClientTest.class

diff --git a/client/bin/main/org/opensearch/ml/client/MachineLearningClient.class b/client/bin/main/org/opensearch/ml/client/MachineLearningClient.class
new file mode 100644
index 0000000000000000000000000000000000000000..7cb93b25f68c166d35d3f68e582fef5de09213c5
GIT binary patch
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diff --git a/client/bin/main/org/opensearch/ml/client/MachineLearningNodeClient.class b/client/bin/main/org/opensearch/ml/client/MachineLearningNodeClient.class
new file mode 100644
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new file mode 100644
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new file mode 100644
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diff --git a/client/build.gradle b/client/build.gradle
index f4cf9f1900..db3201ff59 100644
--- a/client/build.gradle
+++ b/client/build.gradle
@@ -48,6 +48,8 @@ jacocoTestCoverageVerification {
 check.dependsOn jacocoTestCoverageVerification
 
 tasks.named("jar").configure { dependsOn("publishShadowPublicationToMavenLocal") }
+tasks.named("jar").configure { dependsOn("publishShadowPublicationToSnapshotsRepository") }
+tasks.named("jar").configure { dependsOn("publishShadowPublicationToStagingRepository") }
 
 shadowJar {
     archiveClassifier.set(null)

From 84b837d7dba2713e2c82960aef9022c71bb91106 Mon Sep 17 00:00:00 2001
From: Sicheng Song <sicheng.song@outlook.com>
Date: Thu, 18 May 2023 22:08:41 +0000
Subject: [PATCH 2/4] Remove build cache

Signed-off-by: Sicheng Song <sicheng.song@outlook.com>
---
 .../ml/client/MachineLearningClient.class       | Bin 5901 -> 0 bytes
 .../ml/client/MachineLearningNodeClient.class   | Bin 19056 -> 0 bytes
 .../org/opensearch/ml/client/package-info.class | Bin 130 -> 0 bytes
 .../org.mockito.plugins.MockMaker               |   1 -
 .../ml/client/MachineLearningClientTest$1.class | Bin 5245 -> 0 bytes
 .../ml/client/MachineLearningClientTest.class   | Bin 8143 -> 0 bytes
 .../client/MachineLearningNodeClientTest.class  | Bin 27764 -> 0 bytes
 7 files changed, 1 deletion(-)
 delete mode 100644 client/bin/main/org/opensearch/ml/client/MachineLearningClient.class
 delete mode 100644 client/bin/main/org/opensearch/ml/client/MachineLearningNodeClient.class
 delete mode 100644 client/bin/main/org/opensearch/ml/client/package-info.class
 delete mode 100644 client/bin/test/mockito-extensions/org.mockito.plugins.MockMaker
 delete mode 100644 client/bin/test/org/opensearch/ml/client/MachineLearningClientTest$1.class
 delete mode 100644 client/bin/test/org/opensearch/ml/client/MachineLearningClientTest.class
 delete mode 100644 client/bin/test/org/opensearch/ml/client/MachineLearningNodeClientTest.class

diff --git a/client/bin/main/org/opensearch/ml/client/MachineLearningClient.class b/client/bin/main/org/opensearch/ml/client/MachineLearningClient.class
deleted file mode 100644
index 7cb93b25f68c166d35d3f68e582fef5de09213c5..0000000000000000000000000000000000000000
GIT binary patch
literal 0
HcmV?d00001

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diff --git a/client/bin/main/org/opensearch/ml/client/MachineLearningNodeClient.class b/client/bin/main/org/opensearch/ml/client/MachineLearningNodeClient.class
deleted file mode 100644
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GIT binary patch
literal 0
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zn^`7#1iU>8UVa75JO-^i?xH>2?MG3O__O#6XrG{H|7!~E5*&tub|Fs<rO_^Tst17f
zsVT6Wq7}fi)Cw{niOp}#%B?KQ^{T{N!@dNvUxrFvfl6M5N?wCXeh)TY#(!1g4^+;t
z!^qxHteEQ!yO4tElNeoQVe}YanN&y)ej`{a<Q<6EL2KD+f1q_x9(zh-N}8HvYDNlE
z@4>u205hK|llwd&zM7TOBfgeQ{U@R2`toI(+9%-aQ}Fc}px|>r!54G@e+d})6ukW%
z&h!;b?H@3;zr)o22~+#pr7qLdWb`pjO+)k@h9j2&aHdR6%S+)5tu*{+Plg2L;jJ{z
z{_CbD@+n^!G)fGl31Scu^T96K`)z9SkXah-($uj1MN=!28Guy4dr-*-6)9@TEi1~E
zmNuX$r)Yq$sfm$fh+-NnMj_=LO~b?(I#85QF`kVUW2sCWOq0bSSxiks8ahsyS`N<N
z6e@+}B6rJIrZymHYG$kbp)5@s2;zk{NE?iQPa;Dbif6;L{k0M5>Huw|R;;c@X(ifN
zb#<^dPAgMa<=S|yN?lFRCTmmF)l_YUHd9^A(hk+;sH?-Yd0MTyny)R=7OSf|tzK(T
zS4*`cv=v&Tnt!m?q^;79g71&!kG0ivi^OW)uC1Xw?P#18K6XH!xSLzF?@*rjkoRaP
zz2o>mw{{%vH`AS32>)I~Z)$7t?>XWOtp)!+Djw8Y(VxUOS{VPfiOJgfoIEX}wP_pi
LZxmOtoV@=BAGG+;


From 5f72f2bfe029bbb442b4057011ebc41c209872b7 Mon Sep 17 00:00:00 2001
From: Sicheng Song <sicheng.song@outlook.com>
Date: Thu, 18 May 2023 22:13:07 +0000
Subject: [PATCH 3/4] Bug fix

Signed-off-by: Sicheng Song <sicheng.song@outlook.com>
---
 client/build.gradle | 1 -
 1 file changed, 1 deletion(-)

diff --git a/client/build.gradle b/client/build.gradle
index db3201ff59..477ce23616 100644
--- a/client/build.gradle
+++ b/client/build.gradle
@@ -48,7 +48,6 @@ jacocoTestCoverageVerification {
 check.dependsOn jacocoTestCoverageVerification
 
 tasks.named("jar").configure { dependsOn("publishShadowPublicationToMavenLocal") }
-tasks.named("jar").configure { dependsOn("publishShadowPublicationToSnapshotsRepository") }
 tasks.named("jar").configure { dependsOn("publishShadowPublicationToStagingRepository") }
 
 shadowJar {

From d40f88c4c4168b39de88526a3e5b3c4d151c9a6f Mon Sep 17 00:00:00 2001
From: Sicheng Song <sicheng.song@outlook.com>
Date: Thu, 18 May 2023 23:35:10 +0000
Subject: [PATCH 4/4] Code fix on OS 3.0 major refactor

Signed-off-by: Sicheng Song <sicheng.song@outlook.com>
---
 .../org/opensearch/ml/common/TestHelper.java  | 14 +--
 .../ml/common/dataframe/BooleanValueTest.java |  4 +-
 .../ml/common/dataframe/ColumnMetaTest.java   |  4 +-
 .../dataframe/DefaultDataFrameTest.java       | 59 +++++++------
 .../ml/common/dataframe/DoubleValueTest.java  |  4 +-
 .../ml/common/dataframe/FloatValueTest.java   |  4 +-
 .../ml/common/dataframe/IntValueTest.java     |  4 +-
 .../ml/common/dataframe/LongValueTest.java    |  8 +-
 .../ml/common/dataframe/NullValueTest.java    |  4 +-
 .../ml/common/dataframe/RowTest.java          | 58 +++++++-----
 .../ml/common/dataframe/ShortValueTest.java   | 10 +--
 .../ml/common/dataframe/StringValueTest.java  |  4 +-
 .../ml/common/input/MLInputTest.java          | 47 +++++-----
 .../AnomalyLocalizationInputTests.java        | 88 ++++++++++---------
 .../common/input/nlp/TextDocsMLInputTest.java | 15 ++--
 .../common/output/MLPredictionOutputTest.java | 16 ++--
 .../common/output/MLTrainingOutputTest.java   |  4 +-
 .../AnomalyLocalizationOutputTests.java       |  4 +-
 .../LocalSampleCalculatorOutputTest.java      |  7 +-
 .../output/sample/SampleAlgoOutputTest.java   |  7 +-
 .../MLDeployModelNodesResponseTest.java       | 14 ++-
 .../deploy/MLDeployModelResponseTest.java     |  4 +-
 .../forward/MLForwardResponseTest.java        | 16 ++--
 .../model/MLModelGetResponseTest.java         |  7 +-
 .../MLPredictionTaskResponseTest.java         | 54 +++++++-----
 .../register/MLRegisterModelInputTest.java    | 48 +++++-----
 .../register/MLRegisterModelResponseTest.java |  4 +-
 .../transport/sync/MLSyncUpResponseTest.java  |  4 +-
 .../transport/task/MLTaskGetResponseTest.java |  7 +-
 .../undeploy/MLUndeployModelInputTest.java    | 35 ++++----
 .../MLUndeployModelNodesResponseTest.java     | 16 ++--
 .../MLUploadModelChunkInputTest.java          |  7 +-
 .../ml/cluster/DiscoveryNodeHelper.java       |  2 +-
 .../org/opensearch/ml/task/MLTaskManager.java | 32 ++++---
 .../opensearch/ml/utils/MLExceptionUtils.java |  3 +-
 .../opensearch/ml/utils/RestActionUtils.java  | 27 +++---
 .../ml/rest/RestMLDeleteModelActionTests.java |  2 +-
 .../ml/rest/RestMLDeleteTaskActionTests.java  |  2 +-
 .../ml/rest/RestMLDeployModelActionTests.java |  2 +-
 .../ml/rest/RestMLExecuteActionTests.java     |  2 +-
 .../ml/rest/RestMLGetModelActionTests.java    |  2 +-
 .../ml/rest/RestMLGetTaskActionTests.java     |  2 +-
 .../ml/rest/RestMLPredictionActionTests.java  |  2 +-
 .../ml/rest/RestMLProfileActionTests.java     |  2 +-
 .../rest/RestMLRegisterModelActionTests.java  |  2 +-
 .../RestMLRegisterModelMetaActionTests.java   |  2 +-
 .../ml/rest/RestMLSearchModelActionTests.java |  2 +-
 .../ml/rest/RestMLSearchTaskActionTests.java  |  2 +-
 .../RestMLTrainAndPredictActionTests.java     |  2 +-
 .../ml/rest/RestMLTrainingActionTests.java    |  2 +-
 .../rest/RestMLUndeployModelActionTests.java  |  2 +-
 .../RestMLUploadModelChunkActionTests.java    |  2 +-
 .../opensearch/ml/utils/IntegTestUtils.java   | 12 +--
 53 files changed, 382 insertions(+), 307 deletions(-)

diff --git a/common/src/test/java/org/opensearch/ml/common/TestHelper.java b/common/src/test/java/org/opensearch/ml/common/TestHelper.java
index 0eef4af5f2..fce35b3c90 100644
--- a/common/src/test/java/org/opensearch/ml/common/TestHelper.java
+++ b/common/src/test/java/org/opensearch/ml/common/TestHelper.java
@@ -5,7 +5,7 @@
 
 package org.opensearch.ml.common;
 
-import org.opensearch.common.Strings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.common.bytes.BytesReference;
 import org.opensearch.common.xcontent.LoggingDeprecationHandler;
 import org.opensearch.common.xcontent.XContentFactory;
@@ -16,7 +16,6 @@
 import org.opensearch.core.xcontent.XContentBuilder;
 import org.opensearch.core.xcontent.XContentParser;
 
-
 import java.io.IOException;
 import java.util.function.Function;
 
@@ -26,7 +25,8 @@ public static <T> void testParse(ToXContentObject obj, Function<XContentParser,
         testParse(obj, function, false);
     }
 
-    public static <T> void testParse(ToXContentObject obj, Function<XContentParser, T> function, boolean wrapWithObject) throws IOException {
+    public static <T> void testParse(ToXContentObject obj, Function<XContentParser, T> function, boolean wrapWithObject)
+            throws IOException {
         XContentBuilder builder = XContentFactory.contentBuilder(XContentType.JSON);
         if (wrapWithObject) {
             builder.startObject();
@@ -35,12 +35,14 @@ public static <T> void testParse(ToXContentObject obj, Function<XContentParser,
         if (wrapWithObject) {
             builder.endObject();
         }
-        String jsonStr = Strings.toString(builder);
+        String jsonStr = org.opensearch.common.Strings.toString(builder);
         testParseFromString(obj, jsonStr, function);
     }
 
-    public static <T> void testParseFromString(ToXContentObject obj, String jsonStr, Function<XContentParser, T> function) throws IOException {
-        XContentParser parser = XContentType.JSON.xContent().createParser(NamedXContentRegistry.EMPTY, LoggingDeprecationHandler.INSTANCE, jsonStr);
+    public static <T> void testParseFromString(ToXContentObject obj, String jsonStr,
+            Function<XContentParser, T> function) throws IOException {
+        XContentParser parser = XContentType.JSON.xContent().createParser(NamedXContentRegistry.EMPTY,
+                LoggingDeprecationHandler.INSTANCE, jsonStr);
         parser.nextToken();
         T parsedObj = function.apply(parser);
         obj.equals(parsedObj);
diff --git a/common/src/test/java/org/opensearch/ml/common/dataframe/BooleanValueTest.java b/common/src/test/java/org/opensearch/ml/common/dataframe/BooleanValueTest.java
index 4e3def5ba1..36be596962 100644
--- a/common/src/test/java/org/opensearch/ml/common/dataframe/BooleanValueTest.java
+++ b/common/src/test/java/org/opensearch/ml/common/dataframe/BooleanValueTest.java
@@ -6,7 +6,7 @@
 package org.opensearch.ml.common.dataframe;
 
 import org.junit.Test;
-import org.opensearch.common.Strings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.common.xcontent.XContentFactory;
 import org.opensearch.common.xcontent.XContentType;
 import org.opensearch.core.xcontent.XContentBuilder;
@@ -31,7 +31,7 @@ public void testToXContent() throws IOException {
         value.toXContent(builder);
 
         assertNotNull(builder);
-        String jsonStr = Strings.toString(builder);
+        String jsonStr = org.opensearch.common.Strings.toString(builder);
         assertEquals("{\"column_type\":\"BOOLEAN\",\"value\":true}", jsonStr);
     }
 }
diff --git a/common/src/test/java/org/opensearch/ml/common/dataframe/ColumnMetaTest.java b/common/src/test/java/org/opensearch/ml/common/dataframe/ColumnMetaTest.java
index f212473e9f..1ea78c04cd 100644
--- a/common/src/test/java/org/opensearch/ml/common/dataframe/ColumnMetaTest.java
+++ b/common/src/test/java/org/opensearch/ml/common/dataframe/ColumnMetaTest.java
@@ -7,7 +7,7 @@
 
 import org.junit.Before;
 import org.junit.Test;
-import org.opensearch.common.Strings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.common.io.stream.BytesStreamOutput;
 import org.opensearch.common.xcontent.XContentFactory;
 import org.opensearch.common.xcontent.XContentType;
@@ -55,7 +55,7 @@ public void testToXContent() throws IOException {
         columnMeta.toXContent(builder);
 
         assertNotNull(builder);
-        String jsonStr = Strings.toString(builder);
+        String jsonStr = org.opensearch.common.Strings.toString(builder);
         assertEquals("{\"name\":\"columnMetaName\",\"column_type\":\"STRING\"}", jsonStr);
     }
 
diff --git a/common/src/test/java/org/opensearch/ml/common/dataframe/DefaultDataFrameTest.java b/common/src/test/java/org/opensearch/ml/common/dataframe/DefaultDataFrameTest.java
index 06d8922b4d..f1addd77f1 100644
--- a/common/src/test/java/org/opensearch/ml/common/dataframe/DefaultDataFrameTest.java
+++ b/common/src/test/java/org/opensearch/ml/common/dataframe/DefaultDataFrameTest.java
@@ -9,7 +9,7 @@
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.ExpectedException;
-import org.opensearch.common.Strings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.common.io.stream.BytesStreamOutput;
 import org.opensearch.common.io.stream.StreamInput;
 import org.opensearch.common.xcontent.XContentFactory;
@@ -173,21 +173,21 @@ public void columnMetas_Success() {
     }
 
     @Test
-    public void remove_Exception_InputColumnIndexBiggerThanColumensLength(){
+    public void remove_Exception_InputColumnIndexBiggerThanColumensLength() {
         exceptionRule.expect(IllegalArgumentException.class);
         exceptionRule.expectMessage("columnIndex can't be negative or bigger than columns length:4");
         defaultDataFrame.remove(4);
     }
 
     @Test
-    public void remove_Exception_InputColumnIndexNegtiveColumensLength(){
+    public void remove_Exception_InputColumnIndexNegtiveColumensLength() {
         exceptionRule.expect(IllegalArgumentException.class);
         exceptionRule.expectMessage("columnIndex can't be negative or bigger than columns length:4");
         defaultDataFrame.remove(-1);
     }
 
     @Test
-    public void remove_EmptyColumnMeta(){
+    public void remove_EmptyColumnMeta() {
         exceptionRule.expect(IllegalArgumentException.class);
         exceptionRule.expectMessage("columnIndex can't be negative or bigger than columns length:0");
         DefaultDataFrame dataFrame = new DefaultDataFrame(new ColumnMeta[0]);
@@ -196,31 +196,31 @@ public void remove_EmptyColumnMeta(){
     }
 
     @Test
-    public void remove_Success(){
+    public void remove_Success() {
         DataFrame dataFrame = defaultDataFrame.remove(3);
         assertEquals(3, dataFrame.columnMetas().length);
         assertEquals(3, dataFrame.getRow(0).size());
     }
 
     @Test
-    public void select_Success(){
-        DataFrame dataFrame = defaultDataFrame.select(new int[]{1, 3});
+    public void select_Success() {
+        DataFrame dataFrame = defaultDataFrame.select(new int[] { 1, 3 });
         assertEquals(2, dataFrame.columnMetas().length);
         assertEquals(2, dataFrame.getRow(0).size());
     }
 
     @Test
-    public void select_Exception_EmptyInputColumns(){
+    public void select_Exception_EmptyInputColumns() {
         exceptionRule.expect(IllegalArgumentException.class);
         exceptionRule.expectMessage("columns can't be null or empty");
         defaultDataFrame.select(new int[0]);
     }
 
     @Test
-    public void select_Exception_InvalidColumn(){
+    public void select_Exception_InvalidColumn() {
         exceptionRule.expect(IllegalArgumentException.class);
         exceptionRule.expectMessage("columnIndex can't be negative or bigger than columns length");
-        defaultDataFrame.select(new int[]{5});
+        defaultDataFrame.select(new int[] { 5 });
     }
 
     @Test
@@ -231,43 +231,44 @@ public void testToXContent() throws IOException {
         builder.endObject();
 
         assertNotNull(builder);
-        String jsonStr = Strings.toString(builder);
+        String jsonStr = org.opensearch.common.Strings.toString(builder);
         assertEquals("{\"column_metas\":[" +
-             "{\"name\":\"c1\",\"column_type\":\"STRING\"}," +
-             "{\"name\":\"c2\",\"column_type\":\"INTEGER\"}," +
-             "{\"name\":\"c3\",\"column_type\":\"DOUBLE\"}," +
-             "{\"name\":\"c4\",\"column_type\":\"BOOLEAN\"}]," +
-             "\"rows\":[" +
-             "{\"values\":[" +
-             "{\"column_type\":\"STRING\",\"value\":\"string\"}," +
-             "{\"column_type\":\"INTEGER\",\"value\":1}," +
-             "{\"column_type\":\"DOUBLE\",\"value\":2.0}," +
-             "{\"column_type\":\"BOOLEAN\",\"value\":true}]}]}", jsonStr);
+                "{\"name\":\"c1\",\"column_type\":\"STRING\"}," +
+                "{\"name\":\"c2\",\"column_type\":\"INTEGER\"}," +
+                "{\"name\":\"c3\",\"column_type\":\"DOUBLE\"}," +
+                "{\"name\":\"c4\",\"column_type\":\"BOOLEAN\"}]," +
+                "\"rows\":[" +
+                "{\"values\":[" +
+                "{\"column_type\":\"STRING\",\"value\":\"string\"}," +
+                "{\"column_type\":\"INTEGER\",\"value\":1}," +
+                "{\"column_type\":\"DOUBLE\",\"value\":2.0}," +
+                "{\"column_type\":\"BOOLEAN\",\"value\":true}]}]}", jsonStr);
     }
 
     @Test
     public void testParse_EmptyDataFrame() throws IOException {
-        ColumnMeta[] columnMetas = new ColumnMeta[] {new ColumnMeta("test_int", ColumnType.INTEGER)};
+        ColumnMeta[] columnMetas = new ColumnMeta[] { new ColumnMeta("test_int", ColumnType.INTEGER) };
         DefaultDataFrame dataFrame = new DefaultDataFrame(columnMetas);
         TestHelper.testParse(dataFrame, function, true);
     }
 
     @Test
     public void testParse_DataFrame() throws IOException {
-        ColumnMeta[] columnMetas = new ColumnMeta[] {new ColumnMeta("test_int", ColumnType.INTEGER)};
+        ColumnMeta[] columnMetas = new ColumnMeta[] { new ColumnMeta("test_int", ColumnType.INTEGER) };
         DefaultDataFrame dataFrame = new DefaultDataFrame(columnMetas);
-        dataFrame.appendRow(new Integer[]{1});
-        dataFrame.appendRow(new Integer[]{2});
+        dataFrame.appendRow(new Integer[] { 1 });
+        dataFrame.appendRow(new Integer[] { 2 });
         TestHelper.testParse(dataFrame, function, true);
     }
 
     @Test
     public void testParse_WrongExtraField() throws IOException {
-        ColumnMeta[] columnMetas = new ColumnMeta[] {new ColumnMeta("test_int", ColumnType.INTEGER)};
+        ColumnMeta[] columnMetas = new ColumnMeta[] { new ColumnMeta("test_int", ColumnType.INTEGER) };
         DefaultDataFrame dataFrame = new DefaultDataFrame(columnMetas);
-        dataFrame.appendRow(new Integer[]{1});
-        dataFrame.appendRow(new Integer[]{2});
-        String jsonStr = "{\"wrong_field\":{\"test\":\"abc\"},\"column_metas\":[{\"name\":\"test_int\",\"column_type\":" +
+        dataFrame.appendRow(new Integer[] { 1 });
+        dataFrame.appendRow(new Integer[] { 2 });
+        String jsonStr = "{\"wrong_field\":{\"test\":\"abc\"},\"column_metas\":[{\"name\":\"test_int\",\"column_type\":"
+                +
                 "\"INTEGER\"}],\"rows\":[{\"values\":[{\"column_type\":\"INTEGER\",\"value\":1}]},{\"values\":" +
                 "[{\"column_type\":\"INTEGER\",\"value\":2}]}]}";
         TestHelper.testParseFromString(dataFrame, jsonStr, function);
diff --git a/common/src/test/java/org/opensearch/ml/common/dataframe/DoubleValueTest.java b/common/src/test/java/org/opensearch/ml/common/dataframe/DoubleValueTest.java
index 3e720f8f1e..a5a74e41a8 100644
--- a/common/src/test/java/org/opensearch/ml/common/dataframe/DoubleValueTest.java
+++ b/common/src/test/java/org/opensearch/ml/common/dataframe/DoubleValueTest.java
@@ -6,7 +6,7 @@
 package org.opensearch.ml.common.dataframe;
 
 import org.junit.Test;
-import org.opensearch.common.Strings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.common.io.stream.BytesStreamOutput;
 import org.opensearch.common.xcontent.XContentFactory;
 import org.opensearch.common.xcontent.XContentType;
@@ -51,7 +51,7 @@ public void testToXContent() throws IOException {
         doubleValue.toXContent(builder);
 
         assertNotNull(builder);
-        String jsonStr = Strings.toString(builder);
+        String jsonStr = org.opensearch.common.Strings.toString(builder);
         assertEquals("{\"column_type\":\"DOUBLE\",\"value\":5.0}", jsonStr);
     }
 }
diff --git a/common/src/test/java/org/opensearch/ml/common/dataframe/FloatValueTest.java b/common/src/test/java/org/opensearch/ml/common/dataframe/FloatValueTest.java
index 08f5ec81e3..b85309779b 100644
--- a/common/src/test/java/org/opensearch/ml/common/dataframe/FloatValueTest.java
+++ b/common/src/test/java/org/opensearch/ml/common/dataframe/FloatValueTest.java
@@ -6,7 +6,7 @@
 package org.opensearch.ml.common.dataframe;
 
 import org.junit.Test;
-import org.opensearch.common.Strings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.common.xcontent.XContentFactory;
 import org.opensearch.common.xcontent.XContentType;
 import org.opensearch.core.xcontent.XContentBuilder;
@@ -34,7 +34,7 @@ public void testToXContent() throws IOException {
         floatValue.toXContent(builder);
 
         assertNotNull(builder);
-        String jsonStr = Strings.toString(builder);
+        String jsonStr = org.opensearch.common.Strings.toString(builder);
         assertEquals("{\"column_type\":\"FLOAT\",\"value\":2.1}", jsonStr);
     }
 }
diff --git a/common/src/test/java/org/opensearch/ml/common/dataframe/IntValueTest.java b/common/src/test/java/org/opensearch/ml/common/dataframe/IntValueTest.java
index 3feea82fc3..a86d58ca6f 100644
--- a/common/src/test/java/org/opensearch/ml/common/dataframe/IntValueTest.java
+++ b/common/src/test/java/org/opensearch/ml/common/dataframe/IntValueTest.java
@@ -6,7 +6,7 @@
 package org.opensearch.ml.common.dataframe;
 
 import org.junit.Test;
-import org.opensearch.common.Strings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.common.xcontent.XContentFactory;
 import org.opensearch.common.xcontent.XContentType;
 import org.opensearch.core.xcontent.XContentBuilder;
@@ -33,7 +33,7 @@ public void testToXContent() throws IOException {
         intValue.toXContent(builder);
 
         assertNotNull(builder);
-        String jsonStr = Strings.toString(builder);
+        String jsonStr = org.opensearch.common.Strings.toString(builder);
         assertEquals("{\"column_type\":\"INTEGER\",\"value\":2}", jsonStr);
     }
 }
diff --git a/common/src/test/java/org/opensearch/ml/common/dataframe/LongValueTest.java b/common/src/test/java/org/opensearch/ml/common/dataframe/LongValueTest.java
index 97b6cbcc1c..1210cddfe7 100644
--- a/common/src/test/java/org/opensearch/ml/common/dataframe/LongValueTest.java
+++ b/common/src/test/java/org/opensearch/ml/common/dataframe/LongValueTest.java
@@ -6,7 +6,7 @@
 package org.opensearch.ml.common.dataframe;
 
 import org.junit.Test;
-import org.opensearch.common.Strings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.common.xcontent.XContentFactory;
 import org.opensearch.common.xcontent.XContentType;
 import org.opensearch.core.xcontent.XContentBuilder;
@@ -20,7 +20,7 @@ public class LongValueTest {
 
     @Test
     public void longValue() {
-        LongValue longValue = new LongValue((long)2);
+        LongValue longValue = new LongValue((long) 2);
         assertEquals(ColumnType.LONG, longValue.columnType());
         assertEquals(2L, longValue.getValue());
         assertEquals(2.0d, longValue.doubleValue(), 1e-5);
@@ -28,12 +28,12 @@ public void longValue() {
 
     @Test
     public void testToXContent() throws IOException {
-        LongValue longValue = new LongValue((long)2);
+        LongValue longValue = new LongValue((long) 2);
         XContentBuilder builder = XContentFactory.contentBuilder(XContentType.JSON);
         longValue.toXContent(builder);
 
         assertNotNull(builder);
-        String jsonStr = Strings.toString(builder);
+        String jsonStr = org.opensearch.common.Strings.toString(builder);
         assertEquals("{\"column_type\":\"LONG\",\"value\":2}", jsonStr);
     }
 }
diff --git a/common/src/test/java/org/opensearch/ml/common/dataframe/NullValueTest.java b/common/src/test/java/org/opensearch/ml/common/dataframe/NullValueTest.java
index 327848a6e8..8721567474 100644
--- a/common/src/test/java/org/opensearch/ml/common/dataframe/NullValueTest.java
+++ b/common/src/test/java/org/opensearch/ml/common/dataframe/NullValueTest.java
@@ -6,7 +6,7 @@
 package org.opensearch.ml.common.dataframe;
 
 import org.junit.Test;
-import org.opensearch.common.Strings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.common.xcontent.XContentFactory;
 import org.opensearch.common.xcontent.XContentType;
 import org.opensearch.core.xcontent.ToXContent;
@@ -34,7 +34,7 @@ public void testToXContent() throws IOException {
         value.toXContent(builder, ToXContent.EMPTY_PARAMS);
 
         assertNotNull(builder);
-        String jsonStr = Strings.toString(builder);
+        String jsonStr = org.opensearch.common.Strings.toString(builder);
         assertEquals("{\"column_type\":\"NULL\"}", jsonStr);
     }
 }
diff --git a/common/src/test/java/org/opensearch/ml/common/dataframe/RowTest.java b/common/src/test/java/org/opensearch/ml/common/dataframe/RowTest.java
index 0cfa5ae18d..0316bc5c8f 100644
--- a/common/src/test/java/org/opensearch/ml/common/dataframe/RowTest.java
+++ b/common/src/test/java/org/opensearch/ml/common/dataframe/RowTest.java
@@ -9,7 +9,7 @@
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.ExpectedException;
-import org.opensearch.common.Strings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.common.io.stream.BytesStreamOutput;
 import org.opensearch.common.xcontent.XContentFactory;
 import org.opensearch.common.xcontent.XContentType;
@@ -40,7 +40,7 @@ public void setup() {
         row = new Row(1);
         row.setValue(0, ColumnValueBuilder.build(0));
 
-        function =  parser -> {
+        function = parser -> {
             try {
                 return Row.parse(parser);
             } catch (IOException e) {
@@ -126,7 +126,7 @@ public void select() {
         row = new Row(2);
         row.setValue(0, ColumnValueBuilder.build(0));
         row.setValue(1, ColumnValueBuilder.build(false));
-        row = row.select(new int[]{1});
+        row = row.select(new int[] { 1 });
         assertEquals(1, row.size());
         assertFalse(row.getValue(0).booleanValue());
     }
@@ -137,52 +137,59 @@ public void testToXContent() throws IOException {
         row.toXContent(builder);
 
         assertNotNull(builder);
-        String jsonStr = Strings.toString(builder);
+        String jsonStr = org.opensearch.common.Strings.toString(builder);
 
         assertEquals("{\"values\":[{\"column_type\":\"INTEGER\",\"value\":0}]}", jsonStr);
     }
 
     @Test
     public void testParse_NullValue() throws IOException {
-        ColumnValue[] values = new ColumnValue[] {new NullValue()};
+        ColumnValue[] values = new ColumnValue[] { new NullValue() };
         Row row = new Row(values);
         testParse(row, function);
     }
 
     @Test
     public void testParse_NullValue_AtLast() throws IOException {
-        ColumnValue[] values = new ColumnValue[] {new IntValue(1), new DoubleValue(2.0), new StringValue("test"), new BooleanValue(true), new NullValue()};
+        ColumnValue[] values = new ColumnValue[] { new IntValue(1), new DoubleValue(2.0), new StringValue("test"),
+                new BooleanValue(true), new NullValue() };
         Row row = new Row(values);
         testParse(row, function);
     }
 
     @Test
     public void testParse_NullValue_AtFirst() throws IOException {
-        ColumnValue[] values = new ColumnValue[] {new NullValue(), new IntValue(1), new DoubleValue(2.0), new StringValue("test"), new BooleanValue(true)};
+        ColumnValue[] values = new ColumnValue[] { new NullValue(), new IntValue(1), new DoubleValue(2.0),
+                new StringValue("test"), new BooleanValue(true) };
         Row row = new Row(values);
         testParse(row, function);
     }
 
     @Test
     public void testParse_NullValue_AtMiddle() throws IOException {
-        ColumnValue[] values = new ColumnValue[] {new IntValue(1), new DoubleValue(2.0), new NullValue(), new StringValue("test"), new BooleanValue(true)};
+        ColumnValue[] values = new ColumnValue[] { new IntValue(1), new DoubleValue(2.0), new NullValue(),
+                new StringValue("test"), new BooleanValue(true) };
         Row row = new Row(values);
         testParse(row, function);
     }
 
     @Test
     public void testParse_ExtraWrongValueField() throws IOException {
-        ColumnValue[] values = new ColumnValue[] {new IntValue(1), new DoubleValue(2.0), new NullValue(), new StringValue("test"), new BooleanValue(true)};
+        ColumnValue[] values = new ColumnValue[] { new IntValue(1), new DoubleValue(2.0), new NullValue(),
+                new StringValue("test"), new BooleanValue(true) };
         Row row = new Row(values);
-        String jsonStr = "{\"values\":[{\"column_type\":\"INTEGER\",\"value\":1},{\"column_type\":\"DOUBLE\",\"value\":2}," +
-                "{\"column_type\":\"NULL\"},{\"column_type\":\"STRING\",\"value\":\"test\"},{\"column_type\":\"BOOLEAN\"," +
+        String jsonStr = "{\"values\":[{\"column_type\":\"INTEGER\",\"value\":1},{\"column_type\":\"DOUBLE\",\"value\":2},"
+                +
+                "{\"column_type\":\"NULL\"},{\"column_type\":\"STRING\",\"value\":\"test\"},{\"column_type\":\"BOOLEAN\","
+                +
                 "\"value\":true},{\"column_type\":\"WRONG\",\"value\":true}],\"wrong_filed\":{\"test\":\"abc\"}}";
         testParseFromString(row, jsonStr, function);
     }
 
     @Test
     public void testParse_EmptyValueField() throws IOException {
-        ColumnValue[] values = new ColumnValue[] {new IntValue(1), new DoubleValue(2.0), new NullValue(), new StringValue("test"), new BooleanValue(true)};
+        ColumnValue[] values = new ColumnValue[] { new IntValue(1), new DoubleValue(2.0), new NullValue(),
+                new StringValue("test"), new BooleanValue(true) };
         Row row = new Row(values);
         String jsonStr = "{\"values\":[{}]}";
         testParseFromString(row, jsonStr, function);
@@ -192,7 +199,8 @@ public void testParse_EmptyValueField() throws IOException {
     public void testParse_WrongColumnTypeField() throws IOException {
         exceptionRule.expect(IllegalArgumentException.class);
         exceptionRule.expectMessage("wrong column type, expect column_type field but got column_type_wrong");
-        ColumnValue[] values = new ColumnValue[] {new IntValue(1), new DoubleValue(2.0), new NullValue(), new StringValue("test"), new BooleanValue(true)};
+        ColumnValue[] values = new ColumnValue[] { new IntValue(1), new DoubleValue(2.0), new NullValue(),
+                new StringValue("test"), new BooleanValue(true) };
         Row row = new Row(values);
         String jsonStr = "{\"values\":[{\"column_type_wrong\":\"INTEGER\",\"value\":1}]}";
         testParseFromString(row, jsonStr, function);
@@ -202,7 +210,8 @@ public void testParse_WrongColumnTypeField() throws IOException {
     public void testParse_WrongValueField() throws IOException {
         exceptionRule.expect(IllegalArgumentException.class);
         exceptionRule.expectMessage("wrong column value, expect value field but got value_wrong");
-        ColumnValue[] values = new ColumnValue[] {new IntValue(1), new DoubleValue(2.0), new NullValue(), new StringValue("test"), new BooleanValue(true)};
+        ColumnValue[] values = new ColumnValue[] { new IntValue(1), new DoubleValue(2.0), new NullValue(),
+                new StringValue("test"), new BooleanValue(true) };
         Row row = new Row(values);
         String jsonStr = "{\"values\":[{\"column_type\":\"INTEGER\",\"value_wrong\":1}]}";
         testParseFromString(row, jsonStr, function);
@@ -216,34 +225,41 @@ public void testEquals_EmptyValues() {
         Row row2 = new Row(values2);
         assertTrue(row1.equals(row2));
 
-        ColumnValue[] values3 = new ColumnValue[] {new IntValue(1), new DoubleValue(2.0), new NullValue(), new StringValue("test"), new BooleanValue(true)};
+        ColumnValue[] values3 = new ColumnValue[] { new IntValue(1), new DoubleValue(2.0), new NullValue(),
+                new StringValue("test"), new BooleanValue(true) };
         Row row3 = new Row(values3);
         assertFalse(row1.equals(row3));
     }
 
     @Test
     public void testEquals_AllValuesMatch() {
-        ColumnValue[] values1 = new ColumnValue[] {new IntValue(1), new DoubleValue(2.0), new NullValue(), new StringValue("test"), new BooleanValue(true)};
+        ColumnValue[] values1 = new ColumnValue[] { new IntValue(1), new DoubleValue(2.0), new NullValue(),
+                new StringValue("test"), new BooleanValue(true) };
         Row row1 = new Row(values1);
-        ColumnValue[] values2 = new ColumnValue[] {new IntValue(1), new DoubleValue(2.0), new NullValue(), new StringValue("test"), new BooleanValue(true)};
+        ColumnValue[] values2 = new ColumnValue[] { new IntValue(1), new DoubleValue(2.0), new NullValue(),
+                new StringValue("test"), new BooleanValue(true) };
         Row row2 = new Row(values2);
         assertTrue(row1.equals(row2));
     }
 
     @Test
     public void testEquals_SomeValueNotMatch() {
-        ColumnValue[] values1 = new ColumnValue[] {new IntValue(1), new DoubleValue(2.0), new NullValue(), new StringValue("test"), new BooleanValue(true)};
+        ColumnValue[] values1 = new ColumnValue[] { new IntValue(1), new DoubleValue(2.0), new NullValue(),
+                new StringValue("test"), new BooleanValue(true) };
         Row row1 = new Row(values1);
-        ColumnValue[] values2 = new ColumnValue[] {new IntValue(2), new DoubleValue(2.0), new NullValue(), new StringValue("test"), new BooleanValue(true)};
+        ColumnValue[] values2 = new ColumnValue[] { new IntValue(2), new DoubleValue(2.0), new NullValue(),
+                new StringValue("test"), new BooleanValue(true) };
         Row row2 = new Row(values2);
         assertFalse(row1.equals(row2));
     }
 
     @Test
     public void testEquals_SomeTypeNotMatch() {
-        ColumnValue[] values1 = new ColumnValue[] {new IntValue(1), new DoubleValue(2.0), new NullValue(), new StringValue("test"), new BooleanValue(true)};
+        ColumnValue[] values1 = new ColumnValue[] { new IntValue(1), new DoubleValue(2.0), new NullValue(),
+                new StringValue("test"), new BooleanValue(true) };
         Row row1 = new Row(values1);
-        ColumnValue[] values2 = new ColumnValue[] {new DoubleValue(1.0), new DoubleValue(2.0), new NullValue(), new StringValue("test"), new BooleanValue(true)};
+        ColumnValue[] values2 = new ColumnValue[] { new DoubleValue(1.0), new DoubleValue(2.0), new NullValue(),
+                new StringValue("test"), new BooleanValue(true) };
         Row row2 = new Row(values2);
         assertFalse(row1.equals(row2));
     }
diff --git a/common/src/test/java/org/opensearch/ml/common/dataframe/ShortValueTest.java b/common/src/test/java/org/opensearch/ml/common/dataframe/ShortValueTest.java
index 6db79f115c..6f075d085a 100644
--- a/common/src/test/java/org/opensearch/ml/common/dataframe/ShortValueTest.java
+++ b/common/src/test/java/org/opensearch/ml/common/dataframe/ShortValueTest.java
@@ -6,7 +6,7 @@
 package org.opensearch.ml.common.dataframe;
 
 import org.junit.Test;
-import org.opensearch.common.Strings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.common.xcontent.XContentFactory;
 import org.opensearch.common.xcontent.XContentType;
 import org.opensearch.core.xcontent.XContentBuilder;
@@ -20,20 +20,20 @@ public class ShortValueTest {
 
     @Test
     public void shortValue() {
-        ShortValue shortValue = new ShortValue((short)2);
+        ShortValue shortValue = new ShortValue((short) 2);
         assertEquals(ColumnType.SHORT, shortValue.columnType());
-        assertEquals((short)2, shortValue.getValue());
+        assertEquals((short) 2, shortValue.getValue());
         assertEquals(2.0d, shortValue.doubleValue(), 1e-5);
     }
 
     @Test
     public void testToXContent() throws IOException {
-        ShortValue shortValue = new ShortValue((short)2);
+        ShortValue shortValue = new ShortValue((short) 2);
         XContentBuilder builder = XContentFactory.contentBuilder(XContentType.JSON);
         shortValue.toXContent(builder);
 
         assertNotNull(builder);
-        String jsonStr = Strings.toString(builder);
+        String jsonStr = org.opensearch.common.Strings.toString(builder);
         assertEquals("{\"column_type\":\"SHORT\",\"value\":2}", jsonStr);
     }
 }
diff --git a/common/src/test/java/org/opensearch/ml/common/dataframe/StringValueTest.java b/common/src/test/java/org/opensearch/ml/common/dataframe/StringValueTest.java
index 6b64c4813c..d1ff2b781f 100644
--- a/common/src/test/java/org/opensearch/ml/common/dataframe/StringValueTest.java
+++ b/common/src/test/java/org/opensearch/ml/common/dataframe/StringValueTest.java
@@ -6,7 +6,7 @@
 package org.opensearch.ml.common.dataframe;
 
 import org.junit.Test;
-import org.opensearch.common.Strings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.common.xcontent.XContentFactory;
 import org.opensearch.common.xcontent.XContentType;
 import org.opensearch.core.xcontent.ToXContent;
@@ -38,7 +38,7 @@ public void testToXContent() throws IOException {
         value.toXContent(builder, ToXContent.EMPTY_PARAMS);
 
         assertNotNull(builder);
-        String jsonStr = Strings.toString(builder);
+        String jsonStr = org.opensearch.common.Strings.toString(builder);
         assertEquals("{\"column_type\":\"STRING\",\"value\":\"str\"}", jsonStr);
     }
 }
diff --git a/common/src/test/java/org/opensearch/ml/common/input/MLInputTest.java b/common/src/test/java/org/opensearch/ml/common/input/MLInputTest.java
index 76b19dc254..42ccdb9bc2 100644
--- a/common/src/test/java/org/opensearch/ml/common/input/MLInputTest.java
+++ b/common/src/test/java/org/opensearch/ml/common/input/MLInputTest.java
@@ -10,7 +10,7 @@
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.ExpectedException;
-import org.opensearch.common.Strings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.common.io.stream.BytesStreamOutput;
 import org.opensearch.common.io.stream.StreamInput;
 import org.opensearch.common.settings.Settings;
@@ -61,11 +61,11 @@ public class MLInputTest {
 
     @Before
     public void setUp() throws Exception {
-        final ColumnMeta[] columnMetas = new ColumnMeta[]{new ColumnMeta("test", ColumnType.DOUBLE)};
+        final ColumnMeta[] columnMetas = new ColumnMeta[] { new ColumnMeta("test", ColumnType.DOUBLE) };
         List<Row> rows = new ArrayList<>();
-        rows.add(new Row(new ColumnValue[]{new DoubleValue(1.0)}));
-        rows.add(new Row(new ColumnValue[]{new DoubleValue(2.0)}));
-        rows.add(new Row(new ColumnValue[]{new DoubleValue(3.0)}));
+        rows.add(new Row(new ColumnValue[] { new DoubleValue(1.0) }));
+        rows.add(new Row(new ColumnValue[] { new DoubleValue(2.0) }));
+        rows.add(new Row(new ColumnValue[] { new DoubleValue(3.0) }));
         DataFrame dataFrame = new DefaultDataFrame(columnMetas, rows);
         input = MLInput.builder()
                 .algorithm(algorithm)
@@ -89,20 +89,23 @@ public void parse_LinearRegression() throws IOException {
                 .searchSourceBuilder(new SearchSourceBuilder().query(new MatchAllQueryBuilder()).size(1))
                 .build();
         String expectedInputStr = "{\"algorithm\":\"LINEAR_REGRESSION\",\"input_index\":[\"index1\"],\"input_query\":{\"size\":1,\"query\":{\"match_all\":{\"boost\":1.0}}}}";
-        testParse(FunctionName.LINEAR_REGRESSION, inputDataset, expectedInputStr,  parsedInput -> {
+        testParse(FunctionName.LINEAR_REGRESSION, inputDataset, expectedInputStr, parsedInput -> {
             assertNotNull(parsedInput.getInputDataset());
-            assertEquals(1, ((SearchQueryInputDataset)parsedInput.getInputDataset()).getIndices().size());
-            assertEquals(indexName, ((SearchQueryInputDataset)parsedInput.getInputDataset()).getIndices().get(0));
+            assertEquals(1, ((SearchQueryInputDataset) parsedInput.getInputDataset()).getIndices().size());
+            assertEquals(indexName, ((SearchQueryInputDataset) parsedInput.getInputDataset()).getIndices().get(0));
         });
 
-        @NonNull DataFrame dataFrame = new DefaultDataFrame(new ColumnMeta[]{ColumnMeta.builder().name("value").columnType(ColumnType.FLOAT).build()});
-        dataFrame.appendRow(new Float[]{1.0f});
+        @NonNull
+        DataFrame dataFrame = new DefaultDataFrame(
+                new ColumnMeta[] { ColumnMeta.builder().name("value").columnType(ColumnType.FLOAT).build() });
+        dataFrame.appendRow(new Float[] { 1.0f });
         DataFrameInputDataset dataFrameInputDataset = DataFrameInputDataset.builder().dataFrame(dataFrame).build();
         expectedInputStr = "{\"algorithm\":\"LINEAR_REGRESSION\",\"input_data\":{\"column_metas\":[{\"name\":\"value\",\"column_type\":\"FLOAT\"}],\"rows\":[{\"values\":[{\"column_type\":\"FLOAT\",\"value\":1.0}]}]}}";
-        testParse(FunctionName.LINEAR_REGRESSION, dataFrameInputDataset, expectedInputStr,  parsedInput -> {
+        testParse(FunctionName.LINEAR_REGRESSION, dataFrameInputDataset, expectedInputStr, parsedInput -> {
             assertNotNull(parsedInput.getInputDataset());
-            assertEquals(1, ((DataFrameInputDataset)parsedInput.getInputDataset()).getDataFrame().size());
-            assertEquals(1.0f, ((DataFrameInputDataset)parsedInput.getInputDataset()).getDataFrame().getRow(0).getValue(0).floatValue(), 1e-5);
+            assertEquals(1, ((DataFrameInputDataset) parsedInput.getInputDataset()).getDataFrame().size());
+            assertEquals(1.0f, ((DataFrameInputDataset) parsedInput.getInputDataset()).getDataFrame().getRow(0)
+                    .getValue(0).floatValue(), 1e-5);
         });
     }
 
@@ -115,7 +118,8 @@ public void parse_TextEmbedding() throws IOException {
                 .targetResponse(Arrays.asList(column))
                 .targetResponsePositions(Arrays.asList(position))
                 .build();
-        TextDocsInputDataSet inputDataset = TextDocsInputDataSet.builder().docs(Arrays.asList(sentence)).resultFilter(resultFilter).build();
+        TextDocsInputDataSet inputDataset = TextDocsInputDataSet.builder().docs(Arrays.asList(sentence))
+                .resultFilter(resultFilter).build();
         String expectedInputStr = "{\"algorithm\":\"TEXT_EMBEDDING\",\"text_docs\":[\"test sentence\"],\"return_bytes\":false,\"return_number\":false,\"target_response\":[\"column1\"],\"target_response_positions\":[1]}";
         testParse(FunctionName.TEXT_EMBEDDING, inputDataset, expectedInputStr, parsedInput -> {
             assertNotNull(parsedInput.getInputDataset());
@@ -135,21 +139,23 @@ public void parse_TextEmbedding_NullResultFilter() throws IOException {
         String expectedInputStr = "{\"algorithm\":\"TEXT_EMBEDDING\",\"text_docs\":[\"test sentence\"]}";
         testParse(FunctionName.TEXT_EMBEDDING, inputDataset, expectedInputStr, parsedInput -> {
             assertNotNull(parsedInput.getInputDataset());
-            assertEquals(1, ((TextDocsInputDataSet)parsedInput.getInputDataset()).getDocs().size());
-            assertEquals(sentence, ((TextDocsInputDataSet)parsedInput.getInputDataset()).getDocs().get(0));
+            assertEquals(1, ((TextDocsInputDataSet) parsedInput.getInputDataset()).getDocs().size());
+            assertEquals(sentence, ((TextDocsInputDataSet) parsedInput.getInputDataset()).getDocs().get(0));
         });
     }
 
-    private void testParse(FunctionName algorithm, MLInputDataset inputDataset, String expectedInputStr, Consumer<MLInput> verify) throws IOException {
+    private void testParse(FunctionName algorithm, MLInputDataset inputDataset, String expectedInputStr,
+            Consumer<MLInput> verify) throws IOException {
         MLInput input = MLInput.builder().inputDataset(inputDataset).algorithm(algorithm).build();
         XContentBuilder builder = XContentFactory.contentBuilder(XContentType.JSON);
         input.toXContent(builder, ToXContent.EMPTY_PARAMS);
         assertNotNull(builder);
-        String jsonStr = Strings.toString(builder);
+        String jsonStr = org.opensearch.common.Strings.toString(builder);
         assertEquals(expectedInputStr, jsonStr);
 
-        XContentParser parser = XContentType.JSON.xContent().createParser(new NamedXContentRegistry(new SearchModule(Settings.EMPTY,
-                Collections.emptyList()).getNamedXContents()), null, jsonStr);
+        XContentParser parser = XContentType.JSON.xContent()
+                .createParser(new NamedXContentRegistry(new SearchModule(Settings.EMPTY,
+                        Collections.emptyList()).getNamedXContents()), null, jsonStr);
         parser.nextToken();
         MLInput parsedInput = MLInput.parse(parser, algorithm.name());
         assertEquals(input.getFunctionName(), parsedInput.getFunctionName());
@@ -157,7 +163,6 @@ private void testParse(FunctionName algorithm, MLInputDataset inputDataset, Stri
         verify.accept(parsedInput);
     }
 
-
     @Test
     public void readInputStream_Success() throws IOException {
         readInputStream(input, parsedInput -> {
diff --git a/common/src/test/java/org/opensearch/ml/common/input/execute/anomalylocalization/AnomalyLocalizationInputTests.java b/common/src/test/java/org/opensearch/ml/common/input/execute/anomalylocalization/AnomalyLocalizationInputTests.java
index 71a8918281..71b1b67509 100644
--- a/common/src/test/java/org/opensearch/ml/common/input/execute/anomalylocalization/AnomalyLocalizationInputTests.java
+++ b/common/src/test/java/org/opensearch/ml/common/input/execute/anomalylocalization/AnomalyLocalizationInputTests.java
@@ -6,7 +6,7 @@
 package org.opensearch.ml.common.input.execute.anomalylocalization;
 
 import org.junit.Test;
-import org.opensearch.common.Strings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.common.io.stream.BytesStreamOutput;
 import org.opensearch.common.io.stream.NamedWriteableAwareStreamInput;
 import org.opensearch.common.io.stream.NamedWriteableRegistry;
@@ -29,51 +29,59 @@
 
 public class AnomalyLocalizationInputTests {
 
-    @Test
-    public void testXContentFullObject() throws Exception {
-        AnomalyLocalizationInput input = new AnomalyLocalizationInput("indexName", Arrays.asList("attribute"), Arrays.asList(AggregationBuilders.max("max").field("field"),
-                AggregationBuilders.min("min").field("field")), "@timestamp", 0L, 10L, 1L, 2, Optional.of(3L),
-                Optional.of(QueryBuilders.matchAllQuery()));
-        XContentBuilder builder = XContentFactory.jsonBuilder();
-        builder = input.toXContent(builder, null);
-        String json = Strings.toString(builder);
+        @Test
+        public void testXContentFullObject() throws Exception {
+                AnomalyLocalizationInput input = new AnomalyLocalizationInput("indexName", Arrays.asList("attribute"),
+                                Arrays.asList(AggregationBuilders.max("max").field("field"),
+                                                AggregationBuilders.min("min").field("field")),
+                                "@timestamp", 0L, 10L, 1L, 2, Optional.of(3L),
+                                Optional.of(QueryBuilders.matchAllQuery()));
+                XContentBuilder builder = XContentFactory.jsonBuilder();
+                builder = input.toXContent(builder, null);
+                String json = org.opensearch.common.Strings.toString(builder);
 
-        XContentParser parser = XContentType.JSON.xContent().createParser(new NamedXContentRegistry(new SearchModule(Settings.EMPTY,
-                Collections.emptyList()).getNamedXContents()), null, json);
-        parser.nextToken();
-        AnomalyLocalizationInput newInput = AnomalyLocalizationInput.parse(parser);
+                XContentParser parser = XContentType.JSON.xContent()
+                                .createParser(new NamedXContentRegistry(new SearchModule(Settings.EMPTY,
+                                                Collections.emptyList()).getNamedXContents()), null, json);
+                parser.nextToken();
+                AnomalyLocalizationInput newInput = AnomalyLocalizationInput.parse(parser);
 
-        assertEquals(input, newInput);
-    }
+                assertEquals(input, newInput);
+        }
 
-    @Test
-    public void testXContentMissingAnomalyStartFilter() throws Exception {
-        AnomalyLocalizationInput input = new AnomalyLocalizationInput("indexName", Arrays.asList("attribute"), Arrays.asList(AggregationBuilders.max("max").field("field")),
-                "@timestamp", 0L, 10L, 1L, 2, Optional.empty(), Optional.empty());
-        XContentBuilder builder = XContentFactory.jsonBuilder();
-        builder = input.toXContent(builder, null);
-        String json = Strings.toString(builder);
+        @Test
+        public void testXContentMissingAnomalyStartFilter() throws Exception {
+                AnomalyLocalizationInput input = new AnomalyLocalizationInput("indexName", Arrays.asList("attribute"),
+                                Arrays.asList(AggregationBuilders.max("max").field("field")),
+                                "@timestamp", 0L, 10L, 1L, 2, Optional.empty(), Optional.empty());
+                XContentBuilder builder = XContentFactory.jsonBuilder();
+                builder = input.toXContent(builder, null);
+                String json = org.opensearch.common.Strings.toString(builder);
 
-        XContentParser parser = XContentType.JSON.xContent().createParser(new NamedXContentRegistry(new SearchModule(Settings.EMPTY,
-                Collections.emptyList()).getNamedXContents()), null, json);
-        parser.nextToken();
-        AnomalyLocalizationInput newInput = AnomalyLocalizationInput.parse(parser);
+                XContentParser parser = XContentType.JSON.xContent()
+                                .createParser(new NamedXContentRegistry(new SearchModule(Settings.EMPTY,
+                                                Collections.emptyList()).getNamedXContents()), null, json);
+                parser.nextToken();
+                AnomalyLocalizationInput newInput = AnomalyLocalizationInput.parse(parser);
 
-        assertEquals(input, newInput);
-    }
+                assertEquals(input, newInput);
+        }
 
-    @Test
-    public void testWriteable() throws Exception {
-        AnomalyLocalizationInput input = new AnomalyLocalizationInput("indexName", Arrays.asList("attribute"), Arrays.asList(AggregationBuilders.max("max").field("field"),
-                AggregationBuilders.min("min").field("field")), "@timestamp", 0L, 10L, 1L, 2, Optional.of(3L),
-                Optional.of(QueryBuilders.matchAllQuery()));
+        @Test
+        public void testWriteable() throws Exception {
+                AnomalyLocalizationInput input = new AnomalyLocalizationInput("indexName", Arrays.asList("attribute"),
+                                Arrays.asList(AggregationBuilders.max("max").field("field"),
+                                                AggregationBuilders.min("min").field("field")),
+                                "@timestamp", 0L, 10L, 1L, 2, Optional.of(3L),
+                                Optional.of(QueryBuilders.matchAllQuery()));
 
-        BytesStreamOutput out = new BytesStreamOutput();
-        input.writeTo(out);
-        StreamInput in = new NamedWriteableAwareStreamInput(out.bytes().streamInput(),
-                new NamedWriteableRegistry(new SearchModule(Settings.EMPTY, Collections.emptyList()).getNamedWriteables()));
-        AnomalyLocalizationInput newInput = new AnomalyLocalizationInput(in);
+                BytesStreamOutput out = new BytesStreamOutput();
+                input.writeTo(out);
+                StreamInput in = new NamedWriteableAwareStreamInput(out.bytes().streamInput(),
+                                new NamedWriteableRegistry(new SearchModule(Settings.EMPTY, Collections.emptyList())
+                                                .getNamedWriteables()));
+                AnomalyLocalizationInput newInput = new AnomalyLocalizationInput(in);
 
-        assertEquals(input, newInput);
-    }
+                assertEquals(input, newInput);
+        }
 }
diff --git a/common/src/test/java/org/opensearch/ml/common/input/nlp/TextDocsMLInputTest.java b/common/src/test/java/org/opensearch/ml/common/input/nlp/TextDocsMLInputTest.java
index 10176140b6..2a097e2047 100644
--- a/common/src/test/java/org/opensearch/ml/common/input/nlp/TextDocsMLInputTest.java
+++ b/common/src/test/java/org/opensearch/ml/common/input/nlp/TextDocsMLInputTest.java
@@ -4,7 +4,7 @@
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.ExpectedException;
-import org.opensearch.common.Strings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.common.settings.Settings;
 import org.opensearch.common.xcontent.XContentFactory;
 import org.opensearch.common.xcontent.XContentType;
@@ -38,8 +38,10 @@ public class TextDocsMLInputTest {
 
     @Before
     public void setUp() throws Exception {
-        ModelResultFilter resultFilter = ModelResultFilter.builder().returnBytes(true).returnNumber(true).targetResponse(Arrays.asList("field1")).targetResponsePositions(Arrays.asList(2)).build();
-        MLInputDataset inputDataset = TextDocsInputDataSet.builder().docs(Arrays.asList("doc1", "doc2")).resultFilter(resultFilter).build();
+        ModelResultFilter resultFilter = ModelResultFilter.builder().returnBytes(true).returnNumber(true)
+                .targetResponse(Arrays.asList("field1")).targetResponsePositions(Arrays.asList(2)).build();
+        MLInputDataset inputDataset = TextDocsInputDataSet.builder().docs(Arrays.asList("doc1", "doc2"))
+                .resultFilter(resultFilter).build();
         input = new TextDocsMLInput(algorithm, inputDataset);
     }
 
@@ -47,7 +49,7 @@ public void setUp() throws Exception {
     public void parseTextDocsMLInput() throws IOException {
         XContentBuilder builder = XContentFactory.contentBuilder(XContentType.JSON);
         input.toXContent(builder, ToXContent.EMPTY_PARAMS);
-        String jsonStr = Strings.toString(builder);
+        String jsonStr = org.opensearch.common.Strings.toString(builder);
         System.out.println(jsonStr);
         parseMLInput(jsonStr);
     }
@@ -65,8 +67,9 @@ public void parseTextDocsMLInput_NewWay() throws IOException {
     }
 
     private void parseMLInput(String jsonStr) throws IOException {
-        XContentParser parser = XContentType.JSON.xContent().createParser(new NamedXContentRegistry(new SearchModule(Settings.EMPTY,
-                Collections.emptyList()).getNamedXContents()), null, jsonStr);
+        XContentParser parser = XContentType.JSON.xContent()
+                .createParser(new NamedXContentRegistry(new SearchModule(Settings.EMPTY,
+                        Collections.emptyList()).getNamedXContents()), null, jsonStr);
         parser.nextToken();
 
         MLInput parsedInput = MLInput.parse(parser, input.getFunctionName().name());
diff --git a/common/src/test/java/org/opensearch/ml/common/output/MLPredictionOutputTest.java b/common/src/test/java/org/opensearch/ml/common/output/MLPredictionOutputTest.java
index 99d1c71605..00a6d94e8f 100644
--- a/common/src/test/java/org/opensearch/ml/common/output/MLPredictionOutputTest.java
+++ b/common/src/test/java/org/opensearch/ml/common/output/MLPredictionOutputTest.java
@@ -7,7 +7,7 @@
 
 import org.junit.Before;
 import org.junit.Test;
-import org.opensearch.common.Strings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.common.io.stream.BytesStreamOutput;
 import org.opensearch.common.io.stream.StreamInput;
 import org.opensearch.common.xcontent.XContentFactory;
@@ -31,12 +31,13 @@
 public class MLPredictionOutputTest {
 
     MLPredictionOutput output;
+
     @Before
     public void setUp() {
-        ColumnMeta[] columnMetas = new ColumnMeta[]{new ColumnMeta("test", ColumnType.INTEGER)};
+        ColumnMeta[] columnMetas = new ColumnMeta[] { new ColumnMeta("test", ColumnType.INTEGER) };
         List<Row> rows = new ArrayList<>();
-        rows.add(new Row(new ColumnValue[]{new IntValue(1)}));
-        rows.add(new Row(new ColumnValue[]{new IntValue(2)}));
+        rows.add(new Row(new ColumnValue[] { new IntValue(1) }));
+        rows.add(new Row(new ColumnValue[] { new IntValue(2) }));
         DataFrame dataFrame = new DefaultDataFrame(columnMetas, rows);
         output = MLPredictionOutput.builder()
                 .taskId("test_task_id")
@@ -44,11 +45,12 @@ public void setUp() {
                 .predictionResult(dataFrame)
                 .build();
     }
+
     @Test
     public void toXContent() throws IOException {
         XContentBuilder builder = XContentFactory.contentBuilder(XContentType.JSON);
         output.toXContent(builder, ToXContent.EMPTY_PARAMS);
-        String jsonStr = Strings.toString(builder);
+        String jsonStr = org.opensearch.common.Strings.toString(builder);
         assertEquals("{\"task_id\":\"test_task_id\",\"status\":\"test_status\",\"prediction_result\":" +
                 "{\"column_metas\":[{\"name\":\"test\",\"column_type\":\"INTEGER\"}],\"rows\":[{\"values\":" +
                 "[{\"column_type\":\"INTEGER\",\"value\":1}]},{\"values\":[{\"column_type\":\"INTEGER\"," +
@@ -60,7 +62,7 @@ public void toXContent_EmptyOutput() throws IOException {
         MLPredictionOutput output = MLPredictionOutput.builder().build();
         XContentBuilder builder = XContentFactory.contentBuilder(XContentType.JSON);
         output.toXContent(builder, ToXContent.EMPTY_PARAMS);
-        String jsonStr = Strings.toString(builder);
+        String jsonStr = org.opensearch.common.Strings.toString(builder);
         assertEquals("{}", jsonStr);
     }
 
@@ -90,7 +92,7 @@ private void readInputStream(MLPredictionOutput output) throws IOException {
             assertEquals(output.predictionResult, parsedOutput.getPredictionResult());
         } else {
             assertEquals(output.predictionResult.size(), parsedOutput.getPredictionResult().size());
-            for (int i = 0 ;i<output.predictionResult.size(); i++) {
+            for (int i = 0; i < output.predictionResult.size(); i++) {
                 Row row = output.predictionResult.getRow(i);
                 Row parsedRow = parsedOutput.predictionResult.getRow(i);
                 assertEquals(row, parsedRow);
diff --git a/common/src/test/java/org/opensearch/ml/common/output/MLTrainingOutputTest.java b/common/src/test/java/org/opensearch/ml/common/output/MLTrainingOutputTest.java
index 3e5fb120ea..c1836a4e9b 100644
--- a/common/src/test/java/org/opensearch/ml/common/output/MLTrainingOutputTest.java
+++ b/common/src/test/java/org/opensearch/ml/common/output/MLTrainingOutputTest.java
@@ -6,7 +6,7 @@
 package org.opensearch.ml.common.output;
 
 import org.junit.Test;
-import org.opensearch.common.Strings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.common.xcontent.XContentFactory;
 import org.opensearch.common.xcontent.XContentType;
 import org.opensearch.core.xcontent.ToXContent;
@@ -24,7 +24,7 @@ public void parse_MLTrain() throws IOException {
                 .modelId("test_modelId").status("test_status").build();
         XContentBuilder builder = XContentFactory.contentBuilder(XContentType.JSON);
         output.toXContent(builder, ToXContent.EMPTY_PARAMS);
-        String jsonStr = Strings.toString(builder);
+        String jsonStr = org.opensearch.common.Strings.toString(builder);
         assertEquals("{\"model_id\":\"test_modelId\",\"status\":\"test_status\"}", jsonStr);
     }
 }
diff --git a/common/src/test/java/org/opensearch/ml/common/output/execute/anomalylocalization/AnomalyLocalizationOutputTests.java b/common/src/test/java/org/opensearch/ml/common/output/execute/anomalylocalization/AnomalyLocalizationOutputTests.java
index 41efe59c9d..d691660cd2 100644
--- a/common/src/test/java/org/opensearch/ml/common/output/execute/anomalylocalization/AnomalyLocalizationOutputTests.java
+++ b/common/src/test/java/org/opensearch/ml/common/output/execute/anomalylocalization/AnomalyLocalizationOutputTests.java
@@ -7,7 +7,7 @@
 
 import org.junit.Before;
 import org.junit.Test;
-import org.opensearch.common.Strings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.common.io.stream.BytesStreamOutput;
 import org.opensearch.common.xcontent.XContentFactory;
 import org.opensearch.common.xcontent.XContentType;
@@ -51,7 +51,7 @@ public void testXContent() throws Exception {
         builder.startObject();
         builder = output.toXContent(builder, null);
         builder.endObject();
-        String json = Strings.toString(builder);
+        String json = org.opensearch.common.Strings.toString(builder);
         XContentParser parser = XContentType.JSON.xContent().createParser(NamedXContentRegistry.EMPTY, null, json);
         AnomalyLocalizationOutput newOutput = AnomalyLocalizationOutput.parse(parser);
 
diff --git a/common/src/test/java/org/opensearch/ml/common/output/execute/samplecalculator/LocalSampleCalculatorOutputTest.java b/common/src/test/java/org/opensearch/ml/common/output/execute/samplecalculator/LocalSampleCalculatorOutputTest.java
index 0e47a75a64..cda3b375fd 100644
--- a/common/src/test/java/org/opensearch/ml/common/output/execute/samplecalculator/LocalSampleCalculatorOutputTest.java
+++ b/common/src/test/java/org/opensearch/ml/common/output/execute/samplecalculator/LocalSampleCalculatorOutputTest.java
@@ -7,7 +7,7 @@
 
 import org.junit.Before;
 import org.junit.Test;
-import org.opensearch.common.Strings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.common.io.stream.BytesStreamOutput;
 import org.opensearch.common.io.stream.StreamInput;
 import org.opensearch.common.xcontent.XContentFactory;
@@ -22,6 +22,7 @@
 public class LocalSampleCalculatorOutputTest {
 
     LocalSampleCalculatorOutput output;
+
     @Before
     public void setUp() {
         output = LocalSampleCalculatorOutput.builder()
@@ -35,7 +36,7 @@ public void toXContent() throws IOException {
         builder.startObject();
         output.toXContent(builder, ToXContent.EMPTY_PARAMS);
         builder.endObject();
-        String jsonStr = Strings.toString(builder);
+        String jsonStr = org.opensearch.common.Strings.toString(builder);
         assertEquals("{\"result\":1.0}", jsonStr);
     }
 
@@ -46,7 +47,7 @@ public void toXContent_EmptyOutput() throws IOException {
         builder.startObject();
         output.toXContent(builder, ToXContent.EMPTY_PARAMS);
         builder.endObject();
-        String jsonStr = Strings.toString(builder);
+        String jsonStr = org.opensearch.common.Strings.toString(builder);
         assertEquals("{}", jsonStr);
     }
 
diff --git a/common/src/test/java/org/opensearch/ml/common/output/sample/SampleAlgoOutputTest.java b/common/src/test/java/org/opensearch/ml/common/output/sample/SampleAlgoOutputTest.java
index d11b6f6acf..541d1ec8c6 100644
--- a/common/src/test/java/org/opensearch/ml/common/output/sample/SampleAlgoOutputTest.java
+++ b/common/src/test/java/org/opensearch/ml/common/output/sample/SampleAlgoOutputTest.java
@@ -7,7 +7,7 @@
 
 import org.junit.Before;
 import org.junit.Test;
-import org.opensearch.common.Strings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.common.io.stream.BytesStreamOutput;
 import org.opensearch.common.io.stream.StreamInput;
 import org.opensearch.common.xcontent.XContentFactory;
@@ -22,6 +22,7 @@
 
 public class SampleAlgoOutputTest {
     SampleAlgoOutput output;
+
     @Before
     public void setUp() {
         output = SampleAlgoOutput.builder()
@@ -33,7 +34,7 @@ public void setUp() {
     public void toXContent() throws IOException {
         XContentBuilder builder = XContentFactory.contentBuilder(XContentType.JSON);
         output.toXContent(builder, ToXContent.EMPTY_PARAMS);
-        String jsonStr = Strings.toString(builder);
+        String jsonStr = org.opensearch.common.Strings.toString(builder);
         assertEquals("{\"sample_result\":1.0}", jsonStr);
     }
 
@@ -42,7 +43,7 @@ public void toXContent_EmptyOutput() throws IOException {
         SampleAlgoOutput output = SampleAlgoOutput.builder().build();
         XContentBuilder builder = XContentFactory.contentBuilder(XContentType.JSON);
         output.toXContent(builder, ToXContent.EMPTY_PARAMS);
-        String jsonStr = Strings.toString(builder);
+        String jsonStr = org.opensearch.common.Strings.toString(builder);
         assertEquals("{}", jsonStr);
     }
 
diff --git a/common/src/test/java/org/opensearch/ml/common/transport/deploy/MLDeployModelNodesResponseTest.java b/common/src/test/java/org/opensearch/ml/common/transport/deploy/MLDeployModelNodesResponseTest.java
index b13e3c59ef..1374b99392 100644
--- a/common/src/test/java/org/opensearch/ml/common/transport/deploy/MLDeployModelNodesResponseTest.java
+++ b/common/src/test/java/org/opensearch/ml/common/transport/deploy/MLDeployModelNodesResponseTest.java
@@ -9,7 +9,7 @@
 import org.opensearch.action.FailedNodeException;
 import org.opensearch.cluster.ClusterName;
 import org.opensearch.cluster.node.DiscoveryNode;
-import org.opensearch.common.Strings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.common.io.stream.BytesStreamOutput;
 import org.opensearch.common.transport.TransportAddress;
 import org.opensearch.common.xcontent.XContentFactory;
@@ -35,7 +35,6 @@ public void setUp() throws Exception {
         clusterName = new ClusterName("clusterName");
     }
 
-
     @Test
     public void testSerializationDeserialization() throws IOException {
         List<MLDeployModelNodeResponse> responseList = new ArrayList<>();
@@ -56,8 +55,7 @@ public void testToXContent() throws IOException {
                 new TransportAddress(InetAddress.getLoopbackAddress(), 9300),
                 Collections.emptyMap(),
                 Collections.singleton(CLUSTER_MANAGER_ROLE),
-                Version.CURRENT
-        );
+                Version.CURRENT);
         Map<String, String> modelToDeployStatus1 = new HashMap<>();
         modelToDeployStatus1.put("modelName:version1", "response");
         nodes.add(new MLDeployModelNodeResponse(node1, modelToDeployStatus1));
@@ -68,8 +66,7 @@ public void testToXContent() throws IOException {
                 new TransportAddress(InetAddress.getLoopbackAddress(), 9300),
                 Collections.emptyMap(),
                 Collections.singleton(CLUSTER_MANAGER_ROLE),
-                Version.CURRENT
-        );
+                Version.CURRENT);
         Map<String, String> modelToDeployStatus2 = new HashMap<>();
         modelToDeployStatus2.put("modelName:version2", "response");
         nodes.add(new MLDeployModelNodeResponse(node2, modelToDeployStatus2));
@@ -78,10 +75,9 @@ public void testToXContent() throws IOException {
         MLDeployModelNodesResponse response = new MLDeployModelNodesResponse(clusterName, nodes, failures);
         XContentBuilder builder = XContentFactory.contentBuilder(XContentType.JSON);
         response.toXContent(builder, ToXContent.EMPTY_PARAMS);
-        String jsonStr = Strings.toString(builder);
+        String jsonStr = org.opensearch.common.Strings.toString(builder);
         assertEquals(
                 "{\"foo1\":{\"stats\":{\"modelName:version1\":\"response\"}},\"foo2\":{\"stats\":{\"modelName:version2\":\"response\"}}}",
-                jsonStr
-        );
+                jsonStr);
     }
 }
diff --git a/common/src/test/java/org/opensearch/ml/common/transport/deploy/MLDeployModelResponseTest.java b/common/src/test/java/org/opensearch/ml/common/transport/deploy/MLDeployModelResponseTest.java
index 90d11d3421..b9afc837a2 100644
--- a/common/src/test/java/org/opensearch/ml/common/transport/deploy/MLDeployModelResponseTest.java
+++ b/common/src/test/java/org/opensearch/ml/common/transport/deploy/MLDeployModelResponseTest.java
@@ -2,7 +2,7 @@
 
 import org.junit.Before;
 import org.junit.Test;
-import org.opensearch.common.Strings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.common.io.stream.BytesStreamOutput;
 import org.opensearch.common.xcontent.XContentFactory;
 import org.opensearch.common.xcontent.XContentType;
@@ -46,7 +46,7 @@ public void testToXContent() throws IOException {
         XContentBuilder builder = XContentFactory.contentBuilder(XContentType.JSON);
         response.toXContent(builder, ToXContent.EMPTY_PARAMS);
         assertNotNull(builder);
-        String jsonStr = Strings.toString(builder);
+        String jsonStr = org.opensearch.common.Strings.toString(builder);
         // Verify the results
         assertEquals("{\"task_id\":\"test_id\"," +
                 "\"status\":\"test\"}", jsonStr);
diff --git a/common/src/test/java/org/opensearch/ml/common/transport/forward/MLForwardResponseTest.java b/common/src/test/java/org/opensearch/ml/common/transport/forward/MLForwardResponseTest.java
index 1fe6602f32..a35cd3ab73 100644
--- a/common/src/test/java/org/opensearch/ml/common/transport/forward/MLForwardResponseTest.java
+++ b/common/src/test/java/org/opensearch/ml/common/transport/forward/MLForwardResponseTest.java
@@ -5,7 +5,7 @@
 import org.junit.runner.RunWith;
 import org.mockito.junit.MockitoJUnitRunner;
 import org.opensearch.action.ActionResponse;
-import org.opensearch.common.Strings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.common.io.stream.BytesStreamOutput;
 import org.opensearch.common.io.stream.StreamOutput;
 import org.opensearch.common.xcontent.XContentFactory;
@@ -32,9 +32,11 @@ public class MLForwardResponseTest {
     @Before
     public void setUp() throws Exception {
         status = "test";
-        DataFrame dataFrame = DataFrameBuilder.load(Collections.singletonList(new HashMap<String, Object>() {{
-            put("key1", 2.0D);
-        }}));
+        DataFrame dataFrame = DataFrameBuilder.load(Collections.singletonList(new HashMap<String, Object>() {
+            {
+                put("key1", 2.0D);
+            }
+        }));
         predictionOutput = MLPredictionOutput.builder()
                 .status("Success")
                 .predictionResult(dataFrame)
@@ -63,9 +65,11 @@ public void testToXContent() throws IOException {
         XContentBuilder builder = XContentFactory.contentBuilder(XContentType.JSON);
         response.toXContent(builder, ToXContent.EMPTY_PARAMS);
         assertNotNull(builder);
-        String jsonStr = Strings.toString(builder);
+        String jsonStr = org.opensearch.common.Strings.toString(builder);
         // Verify the results
-        assertEquals("{\"result\":{\"task_id\":\"taskId\",\"status\":\"Success\",\"prediction_result\":{\"column_metas\":[{\"name\":\"key1\",\"column_type\":\"DOUBLE\"}],\"rows\":[{\"values\":[{\"column_type\":\"DOUBLE\",\"value\":2.0}]}]}}}", jsonStr);
+        assertEquals(
+                "{\"result\":{\"task_id\":\"taskId\",\"status\":\"Success\",\"prediction_result\":{\"column_metas\":[{\"name\":\"key1\",\"column_type\":\"DOUBLE\"}],\"rows\":[{\"values\":[{\"column_type\":\"DOUBLE\",\"value\":2.0}]}]}}}",
+                jsonStr);
     }
 
     @Test
diff --git a/common/src/test/java/org/opensearch/ml/common/transport/model/MLModelGetResponseTest.java b/common/src/test/java/org/opensearch/ml/common/transport/model/MLModelGetResponseTest.java
index 262dbbd7f2..29df2a7740 100644
--- a/common/src/test/java/org/opensearch/ml/common/transport/model/MLModelGetResponseTest.java
+++ b/common/src/test/java/org/opensearch/ml/common/transport/model/MLModelGetResponseTest.java
@@ -7,7 +7,7 @@
 
 import org.junit.Before;
 import org.junit.Test;
-import org.opensearch.common.Strings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.common.io.stream.BytesStreamOutput;
 import org.opensearch.common.xcontent.XContentFactory;
 import org.opensearch.common.xcontent.XContentType;
@@ -58,11 +58,12 @@ public void toXContentTest() throws IOException {
         XContentBuilder builder = XContentFactory.contentBuilder(XContentType.JSON);
         mlModelGetResponse.toXContent(builder, ToXContent.EMPTY_PARAMS);
         assertNotNull(builder);
-        String jsonStr = Strings.toString(builder);
+        String jsonStr = org.opensearch.common.Strings.toString(builder);
         assertEquals("{\"name\":\"model\"," +
                 "\"algorithm\":\"KMEANS\"," +
                 "\"model_version\":\"1.0.0\"," +
                 "\"model_content\":\"content\"," +
-                "\"user\":{\"name\":\"\",\"backend_roles\":[],\"roles\":[],\"custom_attribute_names\":[],\"user_requested_tenant\":null},\"model_state\":\"TRAINED\"}", jsonStr);
+                "\"user\":{\"name\":\"\",\"backend_roles\":[],\"roles\":[],\"custom_attribute_names\":[],\"user_requested_tenant\":null},\"model_state\":\"TRAINED\"}",
+                jsonStr);
     }
 }
diff --git a/common/src/test/java/org/opensearch/ml/common/transport/prediction/MLPredictionTaskResponseTest.java b/common/src/test/java/org/opensearch/ml/common/transport/prediction/MLPredictionTaskResponseTest.java
index 365a86b9fc..bb2948cc70 100644
--- a/common/src/test/java/org/opensearch/ml/common/transport/prediction/MLPredictionTaskResponseTest.java
+++ b/common/src/test/java/org/opensearch/ml/common/transport/prediction/MLPredictionTaskResponseTest.java
@@ -7,7 +7,7 @@
 
 import org.junit.Test;
 import org.opensearch.action.ActionResponse;
-import org.opensearch.common.Strings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.common.io.stream.BytesStreamOutput;
 import org.opensearch.common.io.stream.StreamOutput;
 import org.opensearch.common.xcontent.XContentFactory;
@@ -32,9 +32,11 @@ public void writeTo_Success() throws IOException {
         MLPredictionOutput output = MLPredictionOutput.builder()
                 .taskId("taskId")
                 .status("Success")
-                .predictionResult(DataFrameBuilder.load(Collections.singletonList(new HashMap<String, Object>() {{
-                    put("key1", 2.0D);
-                }})))
+                .predictionResult(DataFrameBuilder.load(Collections.singletonList(new HashMap<String, Object>() {
+                    {
+                        put("key1", 2.0D);
+                    }
+                })))
                 .build();
         MLTaskResponse response = MLTaskResponse.builder()
                 .output(output)
@@ -42,7 +44,7 @@ public void writeTo_Success() throws IOException {
         BytesStreamOutput bytesStreamOutput = new BytesStreamOutput();
         response.writeTo(bytesStreamOutput);
         response = new MLTaskResponse(bytesStreamOutput.bytes().streamInput());
-        MLPredictionOutput mlPredictionOutput = (MLPredictionOutput)response.getOutput();
+        MLPredictionOutput mlPredictionOutput = (MLPredictionOutput) response.getOutput();
         assertEquals("taskId", mlPredictionOutput.getTaskId());
         assertEquals("Success", mlPredictionOutput.getStatus());
         assertEquals(1, mlPredictionOutput.getPredictionResult().size());
@@ -53,9 +55,11 @@ public void fromActionResponse_WithMLPredictionTaskResponse() {
         MLPredictionOutput output = MLPredictionOutput.builder()
                 .taskId("taskId")
                 .status("Success")
-                .predictionResult(DataFrameBuilder.load(Collections.singletonList(new HashMap<String, Object>() {{
-                    put("key1", 2.0D);
-                }})))
+                .predictionResult(DataFrameBuilder.load(Collections.singletonList(new HashMap<String, Object>() {
+                    {
+                        put("key1", 2.0D);
+                    }
+                })))
                 .build();
         MLTaskResponse response = MLTaskResponse.builder()
                 .output(output)
@@ -68,9 +72,11 @@ public void fromActionResponse_WithNonMLPredictionTaskResponse() {
         MLPredictionOutput output = MLPredictionOutput.builder()
                 .taskId("taskId")
                 .status("Success")
-                .predictionResult(DataFrameBuilder.load(Collections.singletonList(new HashMap<String, Object>() {{
-                    put("key1", 2.0D);
-                }})))
+                .predictionResult(DataFrameBuilder.load(Collections.singletonList(new HashMap<String, Object>() {
+                    {
+                        put("key1", 2.0D);
+                    }
+                })))
                 .build();
         MLTaskResponse response = MLTaskResponse.builder()
                 .output(output)
@@ -88,7 +94,8 @@ public void writeTo(StreamOutput out) throws IOException {
         MLPredictionOutput resultMlPredictionOutput = (MLPredictionOutput) result.getOutput();
         assertEquals(mlPredictionOutput.getTaskId(), resultMlPredictionOutput.getTaskId());
         assertEquals(mlPredictionOutput.getStatus(), resultMlPredictionOutput.getStatus());
-        assertEquals(mlPredictionOutput.getPredictionResult().size(), resultMlPredictionOutput.getPredictionResult().size());
+        assertEquals(mlPredictionOutput.getPredictionResult().size(),
+                resultMlPredictionOutput.getPredictionResult().size());
     }
 
     @Test(expected = UncheckedIOException.class)
@@ -100,7 +107,6 @@ public void writeTo(StreamOutput out) throws IOException {
             }
         };
 
-
         MLTaskResponse.fromActionResponse(actionResponse);
     }
 
@@ -109,22 +115,24 @@ public void toXContentTest() throws IOException {
         MLPredictionOutput output = MLPredictionOutput.builder()
                 .taskId("b5009b99-268f-476d-a676-379a30f82457")
                 .status("Success")
-                .predictionResult(DataFrameBuilder.load(Collections.singletonList(new HashMap<String, Object>() {{
-                    put("ClusterID", 0);
-                }})))
+                .predictionResult(DataFrameBuilder.load(Collections.singletonList(new HashMap<String, Object>() {
+                    {
+                        put("ClusterID", 0);
+                    }
+                })))
                 .build();
         MLTaskResponse response = MLTaskResponse.builder()
-            .output(output)
-            .build();
+                .output(output)
+                .build();
 
         XContentBuilder builder = XContentFactory.contentBuilder(XContentType.JSON);
         response.toXContent(builder, ToXContent.EMPTY_PARAMS);
         assertNotNull(builder);
-        String jsonStr = Strings.toString(builder);
+        String jsonStr = org.opensearch.common.Strings.toString(builder);
         assertEquals("{\"task_id\":\"b5009b99-268f-476d-a676-379a30f82457\"," +
-             "\"status\":\"Success\"," +
-             "\"prediction_result\":{" +
-             "\"column_metas\":[{\"name\":\"ClusterID\",\"column_type\":\"INTEGER\"}]," +
-             "\"rows\":[{\"values\":[{\"column_type\":\"INTEGER\",\"value\":0}]}]}}", jsonStr);
+                "\"status\":\"Success\"," +
+                "\"prediction_result\":{" +
+                "\"column_metas\":[{\"name\":\"ClusterID\",\"column_type\":\"INTEGER\"}]," +
+                "\"rows\":[{\"values\":[{\"column_type\":\"INTEGER\",\"value\":0}]}]}}", jsonStr);
     }
 }
diff --git a/common/src/test/java/org/opensearch/ml/common/transport/register/MLRegisterModelInputTest.java b/common/src/test/java/org/opensearch/ml/common/transport/register/MLRegisterModelInputTest.java
index 0116d6d23b..7f4611c267 100644
--- a/common/src/test/java/org/opensearch/ml/common/transport/register/MLRegisterModelInputTest.java
+++ b/common/src/test/java/org/opensearch/ml/common/transport/register/MLRegisterModelInputTest.java
@@ -8,7 +8,7 @@
 import org.junit.runner.RunWith;
 import org.mockito.Mock;
 import org.mockito.junit.MockitoJUnitRunner;
-import org.opensearch.common.Strings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.common.io.stream.BytesStreamOutput;
 import org.opensearch.common.io.stream.StreamInput;
 import org.opensearch.common.settings.Settings;
@@ -40,8 +40,10 @@ public class MLRegisterModelInputTest {
 
     @Rule
     public ExpectedException exceptionRule = ExpectedException.none();
-    private final String expectedInputStr = "{\"function_name\":\"LINEAR_REGRESSION\",\"name\":\"modelName\",\"version\":\"version\",\"url\":\"url\",\"model_format\":\"ONNX\"," +
-            "\"model_config\":{\"model_type\":\"testModelType\",\"embedding_dimension\":100,\"framework_type\":\"SENTENCE_TRANSFORMERS\"," +
+    private final String expectedInputStr = "{\"function_name\":\"LINEAR_REGRESSION\",\"name\":\"modelName\",\"version\":\"version\",\"url\":\"url\",\"model_format\":\"ONNX\","
+            +
+            "\"model_config\":{\"model_type\":\"testModelType\",\"embedding_dimension\":100,\"framework_type\":\"SENTENCE_TRANSFORMERS\","
+            +
             "\"all_config\":\"{\\\"field1\\\":\\\"value1\\\",\\\"field2\\\":\\\"value2\\\"}\"" +
             "},\"deploy_model\":true,\"model_node_ids\":[\"modelNodeIds\"]}";
     private final FunctionName functionName = FunctionName.LINEAR_REGRESSION;
@@ -66,7 +68,7 @@ public void setUp() throws Exception {
                 .modelFormat(MLModelFormat.ONNX)
                 .modelConfig(config)
                 .deployModel(true)
-                .modelNodeIds(new String[]{"modelNodeIds" })
+                .modelNodeIds(new String[] { "modelNodeIds" })
                 .build();
 
     }
@@ -135,11 +137,14 @@ public void constructor_SuccessWithMinimalSetup() {
                 .modelConfig(config)
                 .url(url)
                 .build();
-        // MLRegisterModelInput.functionName is set to FunctionName.TEXT_EMBEDDING if not explicitly passed, with no exception thrown
+        // MLRegisterModelInput.functionName is set to FunctionName.TEXT_EMBEDDING if
+        // not explicitly passed, with no exception thrown
         assertEquals(FunctionName.TEXT_EMBEDDING, input.getFunctionName());
-        // MLRegisterModelInput.deployModel is set to false if not explicitly passed, with no exception thrown
+        // MLRegisterModelInput.deployModel is set to false if not explicitly passed,
+        // with no exception thrown
         assertFalse(input.isDeployModel());
-        // MLRegisterModelInput.deployModel is set to null if not explicitly passed, with no exception thrown
+        // MLRegisterModelInput.deployModel is set to null if not explicitly passed,
+        // with no exception thrown
         assertNull(input.getModelNodeIds());
     }
 
@@ -148,14 +153,13 @@ public void testToXContent() throws Exception {
         XContentBuilder builder = XContentFactory.contentBuilder(XContentType.JSON);
         input.toXContent(builder, ToXContent.EMPTY_PARAMS);
         assertNotNull(builder);
-        String jsonStr = Strings.toString(builder);
+        String jsonStr = org.opensearch.common.Strings.toString(builder);
         assertEquals(expectedInputStr, jsonStr);
     }
 
     @Test
     public void testToXContent_Incomplete() throws Exception {
-        String expectedIncompleteInputStr =
-                "{\"function_name\":\"LINEAR_REGRESSION\",\"name\":\"modelName\"," +
+        String expectedIncompleteInputStr = "{\"function_name\":\"LINEAR_REGRESSION\",\"name\":\"modelName\"," +
                 "\"version\":\"version\",\"deploy_model\":true}";
         input.setUrl(null);
         input.setModelConfig(null);
@@ -164,7 +168,7 @@ public void testToXContent_Incomplete() throws Exception {
         XContentBuilder builder = XContentFactory.contentBuilder(XContentType.JSON);
         input.toXContent(builder, ToXContent.EMPTY_PARAMS);
         assertNotNull(builder);
-        String jsonStr = Strings.toString(builder);
+        String jsonStr = org.opensearch.common.Strings.toString(builder);
         assertEquals(expectedIncompleteInputStr, jsonStr);
     }
 
@@ -179,24 +183,30 @@ public void parse_WithModel() throws Exception {
 
     @Test
     public void parse_WithoutModel() throws Exception {
-        testParseFromJsonString( false, expectedInputStr, parsedInput -> {
+        testParseFromJsonString(false, expectedInputStr, parsedInput -> {
             assertFalse(parsedInput.isDeployModel());
             assertEquals("modelName", parsedInput.getModelName());
             assertEquals("version", parsedInput.getVersion());
         });
     }
 
-    private void testParseFromJsonString(String modelName, String version, Boolean deployModel, String expectedInputStr, Consumer<MLRegisterModelInput> verify) throws Exception {
-        XContentParser parser = XContentType.JSON.xContent().createParser(new NamedXContentRegistry(new SearchModule(Settings.EMPTY,
-                Collections.emptyList()).getNamedXContents()), LoggingDeprecationHandler.INSTANCE, expectedInputStr);
+    private void testParseFromJsonString(String modelName, String version, Boolean deployModel, String expectedInputStr,
+            Consumer<MLRegisterModelInput> verify) throws Exception {
+        XContentParser parser = XContentType.JSON.xContent()
+                .createParser(new NamedXContentRegistry(new SearchModule(Settings.EMPTY,
+                        Collections.emptyList()).getNamedXContents()), LoggingDeprecationHandler.INSTANCE,
+                        expectedInputStr);
         parser.nextToken();
         MLRegisterModelInput parsedInput = MLRegisterModelInput.parse(parser, modelName, version, deployModel);
         verify.accept(parsedInput);
     }
 
-    private void testParseFromJsonString(Boolean deployModel,String expectedInputStr, Consumer<MLRegisterModelInput> verify) throws Exception {
-        XContentParser parser = XContentType.JSON.xContent().createParser(new NamedXContentRegistry(new SearchModule(Settings.EMPTY,
-                Collections.emptyList()).getNamedXContents()), LoggingDeprecationHandler.INSTANCE, expectedInputStr);
+    private void testParseFromJsonString(Boolean deployModel, String expectedInputStr,
+            Consumer<MLRegisterModelInput> verify) throws Exception {
+        XContentParser parser = XContentType.JSON.xContent()
+                .createParser(new NamedXContentRegistry(new SearchModule(Settings.EMPTY,
+                        Collections.emptyList()).getNamedXContents()), LoggingDeprecationHandler.INSTANCE,
+                        expectedInputStr);
         parser.nextToken();
         MLRegisterModelInput parsedInput = MLRegisterModelInput.parse(parser, deployModel);
         verify.accept(parsedInput);
@@ -210,7 +220,6 @@ public void readInputStream_Success() throws IOException {
         });
     }
 
-
     @Test
     public void readInputStream_SuccessWithNullFields() throws IOException {
         input.setModelFormat(null);
@@ -221,7 +230,6 @@ public void readInputStream_SuccessWithNullFields() throws IOException {
         });
     }
 
-
     private void readInputStream(MLRegisterModelInput input, Consumer<MLRegisterModelInput> verify) throws IOException {
         BytesStreamOutput bytesStreamOutput = new BytesStreamOutput();
         input.writeTo(bytesStreamOutput);
diff --git a/common/src/test/java/org/opensearch/ml/common/transport/register/MLRegisterModelResponseTest.java b/common/src/test/java/org/opensearch/ml/common/transport/register/MLRegisterModelResponseTest.java
index 6eefcd1fba..826e4b1ac5 100644
--- a/common/src/test/java/org/opensearch/ml/common/transport/register/MLRegisterModelResponseTest.java
+++ b/common/src/test/java/org/opensearch/ml/common/transport/register/MLRegisterModelResponseTest.java
@@ -2,7 +2,7 @@
 
 import org.junit.Before;
 import org.junit.Test;
-import org.opensearch.common.Strings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.common.io.stream.BytesStreamOutput;
 import org.opensearch.common.xcontent.XContentFactory;
 import org.opensearch.common.xcontent.XContentType;
@@ -46,7 +46,7 @@ public void testToXContent() throws IOException {
         XContentBuilder builder = XContentFactory.contentBuilder(XContentType.JSON);
         response.toXContent(builder, ToXContent.EMPTY_PARAMS);
         assertNotNull(builder);
-        String jsonStr = Strings.toString(builder);
+        String jsonStr = org.opensearch.common.Strings.toString(builder);
         // Verify the results
         assertEquals("{\"task_id\":\"test_id\"," +
                 "\"status\":\"test\"}", jsonStr);
diff --git a/common/src/test/java/org/opensearch/ml/common/transport/sync/MLSyncUpResponseTest.java b/common/src/test/java/org/opensearch/ml/common/transport/sync/MLSyncUpResponseTest.java
index f8bfe61bf7..0bb334cb43 100644
--- a/common/src/test/java/org/opensearch/ml/common/transport/sync/MLSyncUpResponseTest.java
+++ b/common/src/test/java/org/opensearch/ml/common/transport/sync/MLSyncUpResponseTest.java
@@ -4,7 +4,7 @@
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.mockito.junit.MockitoJUnitRunner;
-import org.opensearch.common.Strings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.common.io.stream.BytesStreamOutput;
 import org.opensearch.common.xcontent.XContentFactory;
 import org.opensearch.common.xcontent.XContentType;
@@ -45,7 +45,7 @@ public void testToXContent() throws IOException {
         XContentBuilder builder = XContentFactory.contentBuilder(XContentType.JSON);
         response.toXContent(builder, ToXContent.EMPTY_PARAMS);
         assertNotNull(builder);
-        String jsonStr = Strings.toString(builder);
+        String jsonStr = org.opensearch.common.Strings.toString(builder);
         // Verify the results
         assertEquals("{\"status\":\"test\"}", jsonStr);
     }
diff --git a/common/src/test/java/org/opensearch/ml/common/transport/task/MLTaskGetResponseTest.java b/common/src/test/java/org/opensearch/ml/common/transport/task/MLTaskGetResponseTest.java
index 10b2e0b07c..d464e862e5 100644
--- a/common/src/test/java/org/opensearch/ml/common/transport/task/MLTaskGetResponseTest.java
+++ b/common/src/test/java/org/opensearch/ml/common/transport/task/MLTaskGetResponseTest.java
@@ -2,7 +2,7 @@
 
 import org.junit.Before;
 import org.junit.Test;
-import org.opensearch.common.Strings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.common.io.stream.BytesStreamOutput;
 import org.opensearch.common.xcontent.XContentFactory;
 import org.opensearch.common.xcontent.XContentType;
@@ -71,7 +71,7 @@ public void toXContentTest() throws IOException {
         XContentBuilder builder = XContentFactory.contentBuilder(XContentType.JSON);
         mlTaskGetResponse.toXContent(builder, ToXContent.EMPTY_PARAMS);
         assertNotNull(builder);
-        String jsonStr = Strings.toString(builder);
+        String jsonStr = org.opensearch.common.Strings.toString(builder);
         assertEquals("{\"task_id\":\"id\"," +
                 "\"model_id\":\"model id\"," +
                 "\"task_type\":\"EXECUTION\"," +
@@ -84,7 +84,8 @@ public void toXContentTest() throws IOException {
                 "\"create_time\":123," +
                 "\"last_update_time\":123," +
                 "\"error\":\"error\"," +
-                "\"user\":{\"name\":\"\",\"backend_roles\":[],\"roles\":[],\"custom_attribute_names\":[],\"user_requested_tenant\":null}," +
+                "\"user\":{\"name\":\"\",\"backend_roles\":[],\"roles\":[],\"custom_attribute_names\":[],\"user_requested_tenant\":null},"
+                +
                 "\"is_async\":true}", jsonStr);
     }
 }
diff --git a/common/src/test/java/org/opensearch/ml/common/transport/undeploy/MLUndeployModelInputTest.java b/common/src/test/java/org/opensearch/ml/common/transport/undeploy/MLUndeployModelInputTest.java
index f1e6eee6c4..cdf52df4f4 100644
--- a/common/src/test/java/org/opensearch/ml/common/transport/undeploy/MLUndeployModelInputTest.java
+++ b/common/src/test/java/org/opensearch/ml/common/transport/undeploy/MLUndeployModelInputTest.java
@@ -2,7 +2,7 @@
 
 import org.junit.Before;
 import org.junit.Test;
-import org.opensearch.common.Strings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.common.io.stream.BytesStreamOutput;
 import org.opensearch.common.io.stream.StreamInput;
 import org.opensearch.common.settings.Settings;
@@ -22,9 +22,9 @@
 
 public class MLUndeployModelInputTest {
     private MLUndeployModelInput input;
-    private final String [] modelIds = new String [] {"modelId1","modelId2","modelId3"};
-    private final String [] nodeIds = new String [] {"nodeId1","nodeId2","nodeId3"};
-    private final String expectedInputStr =  "{\"model_ids\":[\"modelId1\",\"modelId2\",\"modelId3\"]," +
+    private final String[] modelIds = new String[] { "modelId1", "modelId2", "modelId3" };
+    private final String[] nodeIds = new String[] { "nodeId1", "nodeId2", "nodeId3" };
+    private final String expectedInputStr = "{\"model_ids\":[\"modelId1\",\"modelId2\",\"modelId3\"]," +
             "\"node_ids\":[\"nodeId1\",\"nodeId2\",\"nodeId3\"]}";
 
     @Before
@@ -40,31 +40,35 @@ public void testToXContent() throws Exception {
         XContentBuilder builder = XContentFactory.contentBuilder(XContentType.JSON);
         input.toXContent(builder, ToXContent.EMPTY_PARAMS);
         assertNotNull(builder);
-        String jsonStr = Strings.toString(builder);
+        String jsonStr = org.opensearch.common.Strings.toString(builder);
         assertEquals(expectedInputStr, jsonStr);
     }
 
     @Test
     public void testParse() throws Exception {
-        XContentParser parser = XContentType.JSON.xContent().createParser(new NamedXContentRegistry(new SearchModule(Settings.EMPTY,
-                Collections.emptyList()).getNamedXContents()), LoggingDeprecationHandler.INSTANCE, expectedInputStr);
+        XContentParser parser = XContentType.JSON.xContent()
+                .createParser(new NamedXContentRegistry(new SearchModule(Settings.EMPTY,
+                        Collections.emptyList()).getNamedXContents()), LoggingDeprecationHandler.INSTANCE,
+                        expectedInputStr);
         parser.nextToken();
         MLUndeployModelInput parsedInput = MLUndeployModelInput.parse(parser);
-        assertArrayEquals(new String [] {"modelId1","modelId2","modelId3"}, parsedInput.getModelIds());
-        assertArrayEquals(new String [] {"nodeId1","nodeId2","nodeId3"}, parsedInput.getNodeIds());
+        assertArrayEquals(new String[] { "modelId1", "modelId2", "modelId3" }, parsedInput.getModelIds());
+        assertArrayEquals(new String[] { "nodeId1", "nodeId2", "nodeId3" }, parsedInput.getNodeIds());
     }
 
     @Test
     public void testParseWithInvalidField() throws Exception {
-        String withInvalidFieldInputStr =  "{\"void\":\"void\"," +
+        String withInvalidFieldInputStr = "{\"void\":\"void\"," +
                 "\"model_ids\":[\"modelId1\",\"modelId2\",\"modelId3\"]," +
                 "\"node_ids\":[\"nodeId1\",\"nodeId2\",\"nodeId3\"]}";
-        XContentParser parser = XContentType.JSON.xContent().createParser(new NamedXContentRegistry(new SearchModule(Settings.EMPTY,
-                Collections.emptyList()).getNamedXContents()), LoggingDeprecationHandler.INSTANCE, withInvalidFieldInputStr);
+        XContentParser parser = XContentType.JSON.xContent()
+                .createParser(new NamedXContentRegistry(new SearchModule(Settings.EMPTY,
+                        Collections.emptyList()).getNamedXContents()), LoggingDeprecationHandler.INSTANCE,
+                        withInvalidFieldInputStr);
         parser.nextToken();
         MLUndeployModelInput parsedInput = MLUndeployModelInput.parse(parser);
-        assertArrayEquals(new String [] {"modelId1","modelId2","modelId3"}, parsedInput.getModelIds());
-        assertArrayEquals(new String [] {"nodeId1","nodeId2","nodeId3"}, parsedInput.getNodeIds());
+        assertArrayEquals(new String[] { "modelId1", "modelId2", "modelId3" }, parsedInput.getModelIds());
+        assertArrayEquals(new String[] { "nodeId1", "nodeId2", "nodeId3" }, parsedInput.getNodeIds());
     }
 
     @Test
@@ -76,5 +80,4 @@ public void readInputStream() throws IOException {
         assertArrayEquals(input.getModelIds(), parsedInput.getModelIds());
         assertArrayEquals(input.getNodeIds(), parsedInput.getNodeIds());
     }
- }
-
+}
diff --git a/common/src/test/java/org/opensearch/ml/common/transport/undeploy/MLUndeployModelNodesResponseTest.java b/common/src/test/java/org/opensearch/ml/common/transport/undeploy/MLUndeployModelNodesResponseTest.java
index 5a384f32df..a20fa951ce 100644
--- a/common/src/test/java/org/opensearch/ml/common/transport/undeploy/MLUndeployModelNodesResponseTest.java
+++ b/common/src/test/java/org/opensearch/ml/common/transport/undeploy/MLUndeployModelNodesResponseTest.java
@@ -9,7 +9,7 @@
 import org.opensearch.action.FailedNodeException;
 import org.opensearch.cluster.ClusterName;
 import org.opensearch.cluster.node.DiscoveryNode;
-import org.opensearch.common.Strings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.common.io.stream.BytesStreamOutput;
 import org.opensearch.common.transport.TransportAddress;
 import org.opensearch.common.xcontent.XContentFactory;
@@ -42,16 +42,14 @@ public void setUp() throws Exception {
                 new TransportAddress(InetAddress.getLoopbackAddress(), 9300),
                 Collections.emptyMap(),
                 Collections.singleton(CLUSTER_MANAGER_ROLE),
-                Version.CURRENT
-        );
+                Version.CURRENT);
         node2 = new DiscoveryNode(
                 "foo2",
                 "foo2",
                 new TransportAddress(InetAddress.getLoopbackAddress(), 9300),
                 Collections.emptyMap(),
                 Collections.singleton(CLUSTER_MANAGER_ROLE),
-                Version.CURRENT
-        );
+                Version.CURRENT);
         modelWorkerNodeCounts = new HashMap<>();
         modelWorkerNodeCounts.put("modelId1", 1);
     }
@@ -60,7 +58,8 @@ public void setUp() throws Exception {
     public void testSerializationDeserialization1() throws IOException {
         List<MLUndeployModelNodeResponse> responseList = new ArrayList<>();
         List<FailedNodeException> failuresList = new ArrayList<>();
-        MLUndeployModelNodesResponse response = new MLUndeployModelNodesResponse(clusterName, responseList, failuresList);
+        MLUndeployModelNodesResponse response = new MLUndeployModelNodesResponse(clusterName, responseList,
+                failuresList);
         BytesStreamOutput output = new BytesStreamOutput();
         response.writeTo(output);
         MLUndeployModelNodesResponse newResponse = new MLUndeployModelNodesResponse(output.bytes().streamInput());
@@ -87,10 +86,9 @@ public void testToXContent() throws IOException {
         MLUndeployModelNodesResponse response = new MLUndeployModelNodesResponse(clusterName, nodes, failures);
         XContentBuilder builder = XContentFactory.contentBuilder(XContentType.JSON);
         response.toXContent(builder, ToXContent.EMPTY_PARAMS);
-        String jsonStr = Strings.toString(builder);
+        String jsonStr = org.opensearch.common.Strings.toString(builder);
         assertEquals(
                 "{\"foo1\":{\"stats\":{\"modelId1\":\"response\"}},\"foo2\":{\"stats\":{\"modelId2\":\"response\"}}}",
-                jsonStr
-        );
+                jsonStr);
     }
 }
diff --git a/common/src/test/java/org/opensearch/ml/common/transport/upload_chunk/MLUploadModelChunkInputTest.java b/common/src/test/java/org/opensearch/ml/common/transport/upload_chunk/MLUploadModelChunkInputTest.java
index c8206097e0..b6fbff0f73 100644
--- a/common/src/test/java/org/opensearch/ml/common/transport/upload_chunk/MLUploadModelChunkInputTest.java
+++ b/common/src/test/java/org/opensearch/ml/common/transport/upload_chunk/MLUploadModelChunkInputTest.java
@@ -7,7 +7,7 @@
 
 import org.junit.Before;
 import org.junit.Test;
-import org.opensearch.common.Strings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.common.io.stream.BytesStreamOutput;
 import org.opensearch.common.io.stream.StreamInput;
 import org.opensearch.common.settings.Settings;
@@ -90,11 +90,12 @@ public void testToXContent() throws IOException {
 	public void testMLUploadModelChunkInputParser() throws IOException {
 		XContentBuilder builder = XContentFactory.jsonBuilder();
 		builder = mlUploadModelChunkInput.toXContent(builder, null);
-		String json = Strings.toString(builder);
+		String json = org.opensearch.common.Strings.toString(builder);
 		XContentParser parser = XContentType.JSON.xContent().createParser(new NamedXContentRegistry(
 				new SearchModule(Settings.EMPTY, Collections.emptyList()).getNamedXContents()), null, json);
 		parser.nextToken();
-		MLUploadModelChunkInput newMlUploadModelChunkInput = MLUploadModelChunkInput.parse(parser, new byte[] { 1, 3, 4 });
+		MLUploadModelChunkInput newMlUploadModelChunkInput = MLUploadModelChunkInput.parse(parser,
+				new byte[] { 1, 3, 4 });
 		assertEquals(mlUploadModelChunkInput, newMlUploadModelChunkInput);
 	}
 
diff --git a/plugin/src/main/java/org/opensearch/ml/cluster/DiscoveryNodeHelper.java b/plugin/src/main/java/org/opensearch/ml/cluster/DiscoveryNodeHelper.java
index 6dcfc1269b..7344c75e79 100644
--- a/plugin/src/main/java/org/opensearch/ml/cluster/DiscoveryNodeHelper.java
+++ b/plugin/src/main/java/org/opensearch/ml/cluster/DiscoveryNodeHelper.java
@@ -18,8 +18,8 @@
 import org.opensearch.cluster.ClusterState;
 import org.opensearch.cluster.node.DiscoveryNode;
 import org.opensearch.cluster.service.ClusterService;
-import org.opensearch.common.Strings;
 import org.opensearch.common.settings.Settings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.ml.common.CommonValue;
 import org.opensearch.ml.utils.MLNodeUtils;
 
diff --git a/plugin/src/main/java/org/opensearch/ml/task/MLTaskManager.java b/plugin/src/main/java/org/opensearch/ml/task/MLTaskManager.java
index 86c313bb15..a7f377a7cf 100644
--- a/plugin/src/main/java/org/opensearch/ml/task/MLTaskManager.java
+++ b/plugin/src/main/java/org/opensearch/ml/task/MLTaskManager.java
@@ -30,9 +30,9 @@
 import org.opensearch.action.update.UpdateRequest;
 import org.opensearch.action.update.UpdateResponse;
 import org.opensearch.client.Client;
-import org.opensearch.common.Strings;
 import org.opensearch.common.util.concurrent.ThreadContext;
 import org.opensearch.common.xcontent.XContentFactory;
+import org.opensearch.core.common.Strings;
 import org.opensearch.core.xcontent.ToXContent;
 import org.opensearch.core.xcontent.XContentBuilder;
 import org.opensearch.ml.common.MLTask;
@@ -68,7 +68,7 @@ public class MLTaskManager {
     /**
      * Constructor to create ML task manager.
      *
-     * @param client client
+     * @param client           client
      * @param mlIndicesHandler ML indices handler
      */
     public MLTaskManager(Client client, ThreadPool threadPool, MLIndicesHandler mlIndicesHandler) {
@@ -141,9 +141,11 @@ public void remove(String taskId) {
             MLTask mlTask = taskCache.getMlTask();
 
             if (mlTask.getState() != MLTaskState.CREATED) {
-                // Task initial state is CREATED. It will move forward to RUNNING state once it starts on worker node.
+                // Task initial state is CREATED. It will move forward to RUNNING state once it
+                // starts on worker node.
                 // When finished or failed, it's possible to move to COMPLETED/FAILED state.
-                // So if its state is not CREATED when remove it, the task already started on worker node, we should
+                // So if its state is not CREATED when remove it, the task already started on
+                // worker node, we should
                 // decrement running task count.
                 AtomicInteger runningTaskCount = runningTasksCount.get(mlTask.getTaskType());
                 if (runningTaskCount != null) {
@@ -190,6 +192,7 @@ public void addNodeError(String taskId, String workerNodeId, String error) {
 
     /**
      * Get all taskIds from cache
+     * 
      * @return an array of all the keys in the taskCaches
      */
     public String[] getAllTaskIds() {
@@ -221,7 +224,8 @@ public void clear() {
 
     /**
      * Create ML task. Will init ML task index first if absent.
-     * @param mlTask ML task
+     * 
+     * @param mlTask   ML task
      * @param listener action listener
      */
     public void createMLTask(MLTask mlTask, ActionListener<IndexResponse> listener) {
@@ -260,9 +264,11 @@ public void updateTaskStateAsRunning(String taskId, boolean isAsyncTask) {
 
     /**
      * Update ML task with default listener.
-     * @param taskId task id
-     * @param updatedFields updated field and values
-     * @param timeoutInMillis time out waiting for updating task semaphore, zero or negative means don't wait at all
+     * 
+     * @param taskId          task id
+     * @param updatedFields   updated field and values
+     * @param timeoutInMillis time out waiting for updating task semaphore, zero or
+     *                        negative means don't wait at all
      * @param removeFromCache remove ML task from cache
      */
     public void updateMLTask(String taskId, Map<String, Object> updatedFields, long timeoutInMillis, boolean removeFromCache) {
@@ -278,10 +284,12 @@ public void updateMLTask(String taskId, Map<String, Object> updatedFields, long
 
     /**
      * Update ML task.
-     * @param taskId task id
-     * @param updatedFields updated field and values
-     * @param listener action listener
-     * @param timeoutInMillis time out waiting for updating task semaphore, zero or negative means don't wait at all
+     * 
+     * @param taskId          task id
+     * @param updatedFields   updated field and values
+     * @param listener        action listener
+     * @param timeoutInMillis time out waiting for updating task semaphore, zero or
+     *                        negative means don't wait at all
      * @param removeFromCache remove ML task from cache
      */
     public void updateMLTask(
diff --git a/plugin/src/main/java/org/opensearch/ml/utils/MLExceptionUtils.java b/plugin/src/main/java/org/opensearch/ml/utils/MLExceptionUtils.java
index de2c713d5e..26b82f335c 100644
--- a/plugin/src/main/java/org/opensearch/ml/utils/MLExceptionUtils.java
+++ b/plugin/src/main/java/org/opensearch/ml/utils/MLExceptionUtils.java
@@ -10,7 +10,6 @@
 
 import org.apache.commons.lang3.exception.ExceptionUtils;
 import org.apache.logging.log4j.Logger;
-import org.opensearch.common.Strings;
 import org.opensearch.common.xcontent.XContentFactory;
 import org.opensearch.core.xcontent.XContentBuilder;
 import org.opensearch.ml.common.exception.MLLimitExceededException;
@@ -39,7 +38,7 @@ public static String toJsonString(Map<String, String> nodeErrors) throws IOExcep
             builder.field(entry.getKey(), entry.getValue());
         }
         builder.endObject();
-        return Strings.toString(builder);
+        return org.opensearch.common.Strings.toString(builder);
     }
 
     public static void logException(String errorMessage, Exception e, Logger log) {
diff --git a/plugin/src/main/java/org/opensearch/ml/utils/RestActionUtils.java b/plugin/src/main/java/org/opensearch/ml/utils/RestActionUtils.java
index 5241874dcb..ff43a6739f 100644
--- a/plugin/src/main/java/org/opensearch/ml/utils/RestActionUtils.java
+++ b/plugin/src/main/java/org/opensearch/ml/utils/RestActionUtils.java
@@ -18,7 +18,7 @@
 import org.opensearch.cluster.node.DiscoveryNode;
 import org.opensearch.cluster.service.ClusterService;
 import org.opensearch.common.Nullable;
-import org.opensearch.common.Strings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.rest.BytesRestResponse;
 import org.opensearch.rest.RestChannel;
 import org.opensearch.rest.RestRequest;
@@ -75,12 +75,16 @@ public static String getParameterId(RestRequest request, String idName) {
     }
 
     /**
-     * Checks to see if the request came from OpenSearch Dashboards, if so we want to return the UI Metadata from the document.
-     * If the request came from the client then we exclude the UI Metadata from the search result.
+     * Checks to see if the request came from OpenSearch Dashboards, if so we want
+     * to return the UI Metadata from the document.
+     * If the request came from the client then we exclude the UI Metadata from the
+     * search result.
      *
-     * @param request rest request
-     * @param searchSourceBuilder instance of searchSourceBuilder to fetch includes and excludes
-     * @return instance of {@link org.opensearch.search.fetch.subphase.FetchSourceContext}
+     * @param request             rest request
+     * @param searchSourceBuilder instance of searchSourceBuilder to fetch includes
+     *                            and excludes
+     * @return instance of
+     *         {@link org.opensearch.search.fetch.subphase.FetchSourceContext}
      */
     public static FetchSourceContext getSourceContext(RestRequest request, SearchSourceBuilder searchSourceBuilder) {
         String userAgent = coalesceToEmpty(request.header("User-Agent"));
@@ -106,7 +110,8 @@ public static FetchSourceContext getSourceContext(RestRequest request, SearchSou
                 return new FetchSourceContext(true, includes, excludes);
             }
         } else {
-            // When user does not set the _source field in search model api request, searchSourceBuilder.fetchSource becomes null
+            // When user does not set the _source field in search model api request,
+            // searchSourceBuilder.fetchSource becomes null
             String[] excludes = new String[] { OLD_MODEL_CONTENT_FIELD, MODEL_CONTENT_FIELD };
             if (!userAgent.contains(OPENSEARCH_DASHBOARDS_USER_AGENT)) {
                 return new FetchSourceContext(true, Strings.EMPTY_ARRAY, ArrayUtils.add(excludes, "ui_metadata"));
@@ -118,6 +123,7 @@ public static FetchSourceContext getSourceContext(RestRequest request, SearchSou
 
     /**
      * Return FetchSourceContext
+     * 
      * @param returnModelContent if the model content should be returned
      */
     public static FetchSourceContext getFetchSourceContext(boolean returnModelContent) {
@@ -129,6 +135,7 @@ public static FetchSourceContext getFetchSourceContext(boolean returnModelConten
 
     /**
      * Return all nodes in the cluster
+     * 
      * @param clusterService the cluster service
      */
     public static String[] getAllNodes(ClusterService clusterService) {
@@ -142,10 +149,10 @@ public static String[] getAllNodes(ClusterService clusterService) {
 
     /**
      *
-     * @param channel RestChannel
-     * @param status RestStatus enums
+     * @param channel      RestChannel
+     * @param status       RestStatus enums
      * @param errorMessage Error messages
-     * @param exception Reported Exception
+     * @param exception    Reported Exception
      */
     public static void onFailure(RestChannel channel, RestStatus status, String errorMessage, Exception exception) {
         BytesRestResponse bytesRestResponse;
diff --git a/plugin/src/test/java/org/opensearch/ml/rest/RestMLDeleteModelActionTests.java b/plugin/src/test/java/org/opensearch/ml/rest/RestMLDeleteModelActionTests.java
index 2e22c56255..b52f33d58e 100644
--- a/plugin/src/test/java/org/opensearch/ml/rest/RestMLDeleteModelActionTests.java
+++ b/plugin/src/test/java/org/opensearch/ml/rest/RestMLDeleteModelActionTests.java
@@ -21,8 +21,8 @@
 import org.opensearch.action.ActionListener;
 import org.opensearch.action.delete.DeleteResponse;
 import org.opensearch.client.node.NodeClient;
-import org.opensearch.common.Strings;
 import org.opensearch.common.settings.Settings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.core.xcontent.NamedXContentRegistry;
 import org.opensearch.ml.common.transport.model.MLModelDeleteAction;
 import org.opensearch.ml.common.transport.model.MLModelDeleteRequest;
diff --git a/plugin/src/test/java/org/opensearch/ml/rest/RestMLDeleteTaskActionTests.java b/plugin/src/test/java/org/opensearch/ml/rest/RestMLDeleteTaskActionTests.java
index 4c5d3c90d0..c6b8745a86 100644
--- a/plugin/src/test/java/org/opensearch/ml/rest/RestMLDeleteTaskActionTests.java
+++ b/plugin/src/test/java/org/opensearch/ml/rest/RestMLDeleteTaskActionTests.java
@@ -21,8 +21,8 @@
 import org.opensearch.action.ActionListener;
 import org.opensearch.action.delete.DeleteResponse;
 import org.opensearch.client.node.NodeClient;
-import org.opensearch.common.Strings;
 import org.opensearch.common.settings.Settings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.core.xcontent.NamedXContentRegistry;
 import org.opensearch.ml.common.transport.task.MLTaskDeleteAction;
 import org.opensearch.ml.common.transport.task.MLTaskDeleteRequest;
diff --git a/plugin/src/test/java/org/opensearch/ml/rest/RestMLDeployModelActionTests.java b/plugin/src/test/java/org/opensearch/ml/rest/RestMLDeployModelActionTests.java
index b13e6a224f..631dac8b79 100644
--- a/plugin/src/test/java/org/opensearch/ml/rest/RestMLDeployModelActionTests.java
+++ b/plugin/src/test/java/org/opensearch/ml/rest/RestMLDeployModelActionTests.java
@@ -17,10 +17,10 @@
 import org.mockito.Mock;
 import org.opensearch.action.ActionListener;
 import org.opensearch.client.node.NodeClient;
-import org.opensearch.common.Strings;
 import org.opensearch.common.bytes.BytesArray;
 import org.opensearch.common.settings.Settings;
 import org.opensearch.common.xcontent.XContentType;
+import org.opensearch.core.common.Strings;
 import org.opensearch.core.xcontent.NamedXContentRegistry;
 import org.opensearch.ml.common.transport.deploy.MLDeployModelAction;
 import org.opensearch.ml.common.transport.deploy.MLDeployModelRequest;
diff --git a/plugin/src/test/java/org/opensearch/ml/rest/RestMLExecuteActionTests.java b/plugin/src/test/java/org/opensearch/ml/rest/RestMLExecuteActionTests.java
index 156139b2eb..0580ba9723 100644
--- a/plugin/src/test/java/org/opensearch/ml/rest/RestMLExecuteActionTests.java
+++ b/plugin/src/test/java/org/opensearch/ml/rest/RestMLExecuteActionTests.java
@@ -22,8 +22,8 @@
 import org.mockito.MockitoAnnotations;
 import org.opensearch.action.ActionListener;
 import org.opensearch.client.node.NodeClient;
-import org.opensearch.common.Strings;
 import org.opensearch.common.settings.Settings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.ml.common.FunctionName;
 import org.opensearch.ml.common.input.Input;
 import org.opensearch.ml.common.transport.execute.MLExecuteTaskAction;
diff --git a/plugin/src/test/java/org/opensearch/ml/rest/RestMLGetModelActionTests.java b/plugin/src/test/java/org/opensearch/ml/rest/RestMLGetModelActionTests.java
index 3738fb85f3..f951f6b92d 100644
--- a/plugin/src/test/java/org/opensearch/ml/rest/RestMLGetModelActionTests.java
+++ b/plugin/src/test/java/org/opensearch/ml/rest/RestMLGetModelActionTests.java
@@ -22,8 +22,8 @@
 import org.mockito.Mock;
 import org.opensearch.action.ActionListener;
 import org.opensearch.client.node.NodeClient;
-import org.opensearch.common.Strings;
 import org.opensearch.common.settings.Settings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.core.xcontent.NamedXContentRegistry;
 import org.opensearch.ml.common.transport.model.MLModelGetAction;
 import org.opensearch.ml.common.transport.model.MLModelGetRequest;
diff --git a/plugin/src/test/java/org/opensearch/ml/rest/RestMLGetTaskActionTests.java b/plugin/src/test/java/org/opensearch/ml/rest/RestMLGetTaskActionTests.java
index 41c742ef02..365e7e3f18 100644
--- a/plugin/src/test/java/org/opensearch/ml/rest/RestMLGetTaskActionTests.java
+++ b/plugin/src/test/java/org/opensearch/ml/rest/RestMLGetTaskActionTests.java
@@ -20,8 +20,8 @@
 import org.mockito.Mock;
 import org.opensearch.action.ActionListener;
 import org.opensearch.client.node.NodeClient;
-import org.opensearch.common.Strings;
 import org.opensearch.common.settings.Settings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.core.xcontent.NamedXContentRegistry;
 import org.opensearch.ml.common.transport.task.*;
 import org.opensearch.rest.RestChannel;
diff --git a/plugin/src/test/java/org/opensearch/ml/rest/RestMLPredictionActionTests.java b/plugin/src/test/java/org/opensearch/ml/rest/RestMLPredictionActionTests.java
index 0c8361d897..2932ca00bb 100644
--- a/plugin/src/test/java/org/opensearch/ml/rest/RestMLPredictionActionTests.java
+++ b/plugin/src/test/java/org/opensearch/ml/rest/RestMLPredictionActionTests.java
@@ -25,8 +25,8 @@
 import org.mockito.MockitoAnnotations;
 import org.opensearch.action.ActionListener;
 import org.opensearch.client.node.NodeClient;
-import org.opensearch.common.Strings;
 import org.opensearch.common.settings.Settings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.ml.common.FunctionName;
 import org.opensearch.ml.common.MLModel;
 import org.opensearch.ml.common.input.MLInput;
diff --git a/plugin/src/test/java/org/opensearch/ml/rest/RestMLProfileActionTests.java b/plugin/src/test/java/org/opensearch/ml/rest/RestMLProfileActionTests.java
index e8306e4535..795784f227 100644
--- a/plugin/src/test/java/org/opensearch/ml/rest/RestMLProfileActionTests.java
+++ b/plugin/src/test/java/org/opensearch/ml/rest/RestMLProfileActionTests.java
@@ -39,11 +39,11 @@
 import org.opensearch.cluster.node.DiscoveryNode;
 import org.opensearch.cluster.node.DiscoveryNodeRole;
 import org.opensearch.cluster.service.ClusterService;
-import org.opensearch.common.Strings;
 import org.opensearch.common.settings.Settings;
 import org.opensearch.common.transport.TransportAddress;
 import org.opensearch.common.xcontent.XContentFactory;
 import org.opensearch.commons.authuser.User;
+import org.opensearch.core.common.Strings;
 import org.opensearch.core.xcontent.NamedXContentRegistry;
 import org.opensearch.ml.action.profile.MLProfileAction;
 import org.opensearch.ml.action.profile.MLProfileNodeResponse;
diff --git a/plugin/src/test/java/org/opensearch/ml/rest/RestMLRegisterModelActionTests.java b/plugin/src/test/java/org/opensearch/ml/rest/RestMLRegisterModelActionTests.java
index 4e5f9f20d1..1e71fab701 100644
--- a/plugin/src/test/java/org/opensearch/ml/rest/RestMLRegisterModelActionTests.java
+++ b/plugin/src/test/java/org/opensearch/ml/rest/RestMLRegisterModelActionTests.java
@@ -19,10 +19,10 @@
 import org.mockito.Mock;
 import org.opensearch.action.ActionListener;
 import org.opensearch.client.node.NodeClient;
-import org.opensearch.common.Strings;
 import org.opensearch.common.bytes.BytesArray;
 import org.opensearch.common.settings.Settings;
 import org.opensearch.common.xcontent.XContentType;
+import org.opensearch.core.common.Strings;
 import org.opensearch.core.xcontent.NamedXContentRegistry;
 import org.opensearch.ml.common.transport.model.MLModelGetResponse;
 import org.opensearch.ml.common.transport.register.MLRegisterModelAction;
diff --git a/plugin/src/test/java/org/opensearch/ml/rest/RestMLRegisterModelMetaActionTests.java b/plugin/src/test/java/org/opensearch/ml/rest/RestMLRegisterModelMetaActionTests.java
index e431d3a22c..503e09f2b9 100644
--- a/plugin/src/test/java/org/opensearch/ml/rest/RestMLRegisterModelMetaActionTests.java
+++ b/plugin/src/test/java/org/opensearch/ml/rest/RestMLRegisterModelMetaActionTests.java
@@ -22,10 +22,10 @@
 import org.mockito.Mock;
 import org.opensearch.action.ActionListener;
 import org.opensearch.client.node.NodeClient;
-import org.opensearch.common.Strings;
 import org.opensearch.common.bytes.BytesArray;
 import org.opensearch.common.settings.Settings;
 import org.opensearch.common.xcontent.XContentType;
+import org.opensearch.core.common.Strings;
 import org.opensearch.core.xcontent.NamedXContentRegistry;
 import org.opensearch.ml.common.transport.model.MLModelGetResponse;
 import org.opensearch.ml.common.transport.upload_chunk.MLRegisterModelMetaAction;
diff --git a/plugin/src/test/java/org/opensearch/ml/rest/RestMLSearchModelActionTests.java b/plugin/src/test/java/org/opensearch/ml/rest/RestMLSearchModelActionTests.java
index c2f42e2393..baf254f9e6 100644
--- a/plugin/src/test/java/org/opensearch/ml/rest/RestMLSearchModelActionTests.java
+++ b/plugin/src/test/java/org/opensearch/ml/rest/RestMLSearchModelActionTests.java
@@ -30,9 +30,9 @@
 import org.opensearch.action.search.SearchResponseSections;
 import org.opensearch.action.search.ShardSearchFailure;
 import org.opensearch.client.node.NodeClient;
-import org.opensearch.common.Strings;
 import org.opensearch.common.settings.Settings;
 import org.opensearch.common.xcontent.XContentFactory;
+import org.opensearch.core.common.Strings;
 import org.opensearch.core.xcontent.XContentBuilder;
 import org.opensearch.ml.common.transport.model.MLModelSearchAction;
 import org.opensearch.ml.utils.TestHelper;
diff --git a/plugin/src/test/java/org/opensearch/ml/rest/RestMLSearchTaskActionTests.java b/plugin/src/test/java/org/opensearch/ml/rest/RestMLSearchTaskActionTests.java
index df030118b1..58713cb277 100644
--- a/plugin/src/test/java/org/opensearch/ml/rest/RestMLSearchTaskActionTests.java
+++ b/plugin/src/test/java/org/opensearch/ml/rest/RestMLSearchTaskActionTests.java
@@ -9,7 +9,7 @@
 
 import org.hamcrest.Matchers;
 import org.junit.Before;
-import org.opensearch.common.Strings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.rest.RestHandler;
 import org.opensearch.rest.RestRequest;
 import org.opensearch.test.OpenSearchTestCase;
diff --git a/plugin/src/test/java/org/opensearch/ml/rest/RestMLTrainAndPredictActionTests.java b/plugin/src/test/java/org/opensearch/ml/rest/RestMLTrainAndPredictActionTests.java
index ee0857b41f..ef2c9a3f38 100644
--- a/plugin/src/test/java/org/opensearch/ml/rest/RestMLTrainAndPredictActionTests.java
+++ b/plugin/src/test/java/org/opensearch/ml/rest/RestMLTrainAndPredictActionTests.java
@@ -22,8 +22,8 @@
 import org.mockito.MockitoAnnotations;
 import org.opensearch.action.ActionListener;
 import org.opensearch.client.node.NodeClient;
-import org.opensearch.common.Strings;
 import org.opensearch.common.settings.Settings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.ml.common.MLTaskState;
 import org.opensearch.ml.common.input.MLInput;
 import org.opensearch.ml.common.output.MLTrainingOutput;
diff --git a/plugin/src/test/java/org/opensearch/ml/rest/RestMLTrainingActionTests.java b/plugin/src/test/java/org/opensearch/ml/rest/RestMLTrainingActionTests.java
index a2b11aaa21..f795f7117e 100644
--- a/plugin/src/test/java/org/opensearch/ml/rest/RestMLTrainingActionTests.java
+++ b/plugin/src/test/java/org/opensearch/ml/rest/RestMLTrainingActionTests.java
@@ -25,8 +25,8 @@
 import org.mockito.MockitoAnnotations;
 import org.opensearch.action.ActionListener;
 import org.opensearch.client.node.NodeClient;
-import org.opensearch.common.Strings;
 import org.opensearch.common.settings.Settings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.ml.common.MLTaskState;
 import org.opensearch.ml.common.input.MLInput;
 import org.opensearch.ml.common.output.MLTrainingOutput;
diff --git a/plugin/src/test/java/org/opensearch/ml/rest/RestMLUndeployModelActionTests.java b/plugin/src/test/java/org/opensearch/ml/rest/RestMLUndeployModelActionTests.java
index 55fcb69006..51c391e320 100644
--- a/plugin/src/test/java/org/opensearch/ml/rest/RestMLUndeployModelActionTests.java
+++ b/plugin/src/test/java/org/opensearch/ml/rest/RestMLUndeployModelActionTests.java
@@ -23,10 +23,10 @@
 import org.opensearch.client.node.NodeClient;
 import org.opensearch.cluster.ClusterState;
 import org.opensearch.cluster.service.ClusterService;
-import org.opensearch.common.Strings;
 import org.opensearch.common.bytes.BytesArray;
 import org.opensearch.common.settings.Settings;
 import org.opensearch.common.xcontent.XContentType;
+import org.opensearch.core.common.Strings;
 import org.opensearch.core.xcontent.NamedXContentRegistry;
 import org.opensearch.ml.common.transport.model.MLModelGetResponse;
 import org.opensearch.ml.common.transport.undeploy.MLUndeployModelAction;
diff --git a/plugin/src/test/java/org/opensearch/ml/rest/RestMLUploadModelChunkActionTests.java b/plugin/src/test/java/org/opensearch/ml/rest/RestMLUploadModelChunkActionTests.java
index c3f227789c..307175a352 100644
--- a/plugin/src/test/java/org/opensearch/ml/rest/RestMLUploadModelChunkActionTests.java
+++ b/plugin/src/test/java/org/opensearch/ml/rest/RestMLUploadModelChunkActionTests.java
@@ -19,9 +19,9 @@
 import org.mockito.Mock;
 import org.opensearch.action.ActionListener;
 import org.opensearch.client.node.NodeClient;
-import org.opensearch.common.Strings;
 import org.opensearch.common.bytes.BytesArray;
 import org.opensearch.common.settings.Settings;
+import org.opensearch.core.common.Strings;
 import org.opensearch.core.xcontent.NamedXContentRegistry;
 import org.opensearch.ml.common.transport.model.MLModelGetResponse;
 import org.opensearch.ml.common.transport.upload_chunk.MLUploadModelChunkAction;
diff --git a/plugin/src/test/java/org/opensearch/ml/utils/IntegTestUtils.java b/plugin/src/test/java/org/opensearch/ml/utils/IntegTestUtils.java
index 6979f5b788..9476fec766 100644
--- a/plugin/src/test/java/org/opensearch/ml/utils/IntegTestUtils.java
+++ b/plugin/src/test/java/org/opensearch/ml/utils/IntegTestUtils.java
@@ -22,7 +22,6 @@
 import org.opensearch.action.search.SearchRequest;
 import org.opensearch.action.search.SearchResponse;
 import org.opensearch.action.support.WriteRequest;
-import org.opensearch.common.Strings;
 import org.opensearch.common.unit.TimeValue;
 import org.opensearch.common.xcontent.XContentFactory;
 import org.opensearch.common.xcontent.XContentType;
@@ -117,9 +116,11 @@ public static SearchSourceBuilder generateSearchSourceBuilder() {
     }
 
     /**
-     * Train model and return model id if not async request or task id for async request.
+     * Train model and return model id if not async request or task id for async
+     * request.
+     * 
      * @param inputDataset input data set
-     * @param async async request or not
+     * @param async        async request or not
      * @return model id for sync request or task id for async request.
      */
     public static String trainModel(MLInputDataset inputDataset, boolean async) {
@@ -141,7 +142,8 @@ public static String trainModel(MLInputDataset inputDataset, boolean async) {
         return id;
     }
 
-    // Wait a while (20 seconds at most) for the model to be available in the ml index.
+    // Wait a while (20 seconds at most) for the model to be available in the ml
+    // index.
     public static SearchResponse waitModelAvailable1(String taskId) throws InterruptedException {
         SearchSourceBuilder modelSearchSourceBuilder = new SearchSourceBuilder();
         QueryBuilder queryBuilder = QueryBuilders.termQuery("taskId", taskId);
@@ -194,7 +196,7 @@ public static void predictAndVerifyResult(String taskId, MLInputDataset inputDat
         MLPredictionOutput mlPredictionOutput = (MLPredictionOutput) predictionResponse.getOutput();
         mlPredictionOutput.getPredictionResult().toXContent(builder, ToXContent.EMPTY_PARAMS);
         builder.endObject();
-        String jsonStr = Strings.toString(builder);
+        String jsonStr = org.opensearch.common.Strings.toString(builder);
         String expectedStr1 = "{\"column_metas\":[{\"name\":\"ClusterID\",\"column_type\":\"INTEGER\"}],"
             + "\"rows\":[{\"values\":[{\"column_type\":\"INTEGER\",\"value\":0}]}]}";
         String expectedStr2 = "{\"column_metas\":[{\"name\":\"ClusterID\",\"column_type\":\"INTEGER\"}],"