diff --git a/src/main/java/org/opensearch/timeseries/indices/IndexManagement.java b/src/main/java/org/opensearch/timeseries/indices/IndexManagement.java
index c6357cf24..1c3f30c77 100644
--- a/src/main/java/org/opensearch/timeseries/indices/IndexManagement.java
+++ b/src/main/java/org/opensearch/timeseries/indices/IndexManagement.java
@@ -1240,29 +1240,22 @@ protected void rolloverAndDeleteHistoryIndex(
         String rolloverIndexPattern,
         IndexType resultIndex
     ) {
-        // rollover and delete default result index
+        // perform rollover and delete on default result index
         if (doesDefaultResultIndexExist()) {
             RolloverRequest defaultResultIndexRolloverRequest = buildRolloverRequest(resultIndexAlias, rolloverIndexPattern);
             defaultResultIndexRolloverRequest.addMaxIndexDocsCondition(historyMaxDocs * getNumberOfPrimaryShards());
-            proceedWithDefaultRolloverAndDelete(
-                    resultIndexAlias,
-                    defaultResultIndexRolloverRequest,
-                    allResultIndicesPattern,
-                    resultIndex
-            );
+            proceedWithDefaultRolloverAndDelete(resultIndexAlias, defaultResultIndexRolloverRequest, allResultIndicesPattern, resultIndex);
         }
-
-        // rollover and delete custom result index
+        // get config files that have custom result index alias to perform rollover on
         getConfigsWithCustomResultIndexAlias(ActionListener.wrap(candidateResultAliases -> {
             if (candidateResultAliases == null || candidateResultAliases.isEmpty()) {
                 logger.info("Candidate custom result indices are empty.");
                 return;
             }
 
+            // perform rollover and delete on found custom result index alias
             candidateResultAliases.forEach(config -> handleCustomResultIndex(config, resultIndex));
-        }, e -> {
-            logger.error("Failed to get configs with custom result index alias.", e);
-        }));
+        }, e -> { logger.error("Failed to get configs with custom result index alias.", e); }));
     }
 
     private void handleCustomResultIndex(Config config, IndexType resultIndex) {
diff --git a/src/test/java/org/opensearch/ad/indices/RolloverTests.java b/src/test/java/org/opensearch/ad/indices/RolloverTests.java
index 561170c74..2d847d266 100644
--- a/src/test/java/org/opensearch/ad/indices/RolloverTests.java
+++ b/src/test/java/org/opensearch/ad/indices/RolloverTests.java
@@ -283,7 +283,6 @@ public void testNoCustomResultIndexFound_RolloverDefaultResultIndex_shouldSuccee
 
     public void testCustomResultIndexFound_RolloverCustomResultIndex_withConditions_shouldSucceed() throws IOException {
         setUpGetConfigs_withCustomResultIndexAlias();
-        setUpRolloverSuccessForCustomIndex();
 
         adIndices.rolloverAndDeleteHistoryIndex();
 
@@ -361,7 +360,6 @@ private void setUpGetConfigs_withCustomResultIndexAlias() throws IOException {
         IndexMetadata defaultResultIndex = IndexMetadata
             .builder(".opendistro-anomaly-detectors")
             .settings(settings(Version.CURRENT))
-            .putAlias(AliasMetadata.builder(ADCommonName.ANOMALY_RESULT_INDEX_ALIAS).writeIndex(true).build())
             .numberOfShards(1)
             .numberOfReplicas(0)
             .build();
@@ -396,8 +394,10 @@ private void setUpGetConfigs_withCustomResultIndexAlias() throws IOException {
         doAnswer(invocation -> {
             Object[] args = invocation.getArguments();
             ActionListener<SearchResponse> listener = (ActionListener<SearchResponse>) args[1];
+            setUpRolloverSuccessForCustomIndex();
             listener.onResponse(createSearchResponse(parsedDetector));
             return null;
         }).when(client).search(any(), any());
+
     }
 }