Fix the refactor change brought by core backport

[b4sjoo]

Description

This PR should fix refactor changes in this core backport PR opensearch-project/OpenSearch#8382

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed per the DCO using --signoff

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[codecov]

Codecov Report

Merging #1047 (adc80ba) into 2.x (e6dabc0) will decrease coverage by 0.06%.
The diff coverage is 100.00%.

❗ Current head adc80ba differs from pull request most recent head 89d1fd4. Consider uploading reports for the commit 89d1fd4 to get more accurate results

@@             Coverage Diff              @@
##                2.x    #1047      +/-   ##
============================================
- Coverage     82.32%   82.26%   -0.06%     
  Complexity     1918     1918              
============================================
  Files           149      149              
  Lines          7506     7507       +1     
  Branches        750      750              
============================================
- Hits           6179     6176       -3     
- Misses          987      990       +3     
- Partials        340      341       +1     

Flag	Coverage Δ
ml-commons	82.26% <100.00%> (-0.06%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...org/opensearch/ml/cluster/DiscoveryNodeHelper.java	95.23% <ø> (ø)
...ain/java/org/opensearch/ml/task/MLTaskManager.java	70.39% <ø> (ø)
...nsearch/ml/autoredeploy/MLModelAutoReDeployer.java	91.08% <100.00%> (ø)
.../java/org/opensearch/ml/utils/RestActionUtils.java	83.01% <100.00%> (+0.32%)	⬆️

... and 1 file with indirect coverage changes