fix bwc bug when incrementing to OS 2.6.0

[b4sjoo]

Signed-off-by: Sicheng Song sicheng.song@outlook.com

Description

Description
This PR will fix the bwc test failure when incrementing to version 2.6.0.

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-commenter]

Codecov Report

Merging #705 (fb4a6f3) into 2.x (6ae9257) will decrease coverage by 0.59%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                2.x     #705      +/-   ##
============================================
- Coverage     83.97%   83.38%   -0.59%     
+ Complexity     1033     1019      -14     
============================================
  Files            99       99              
  Lines          3738     3738              
  Branches        344      344              
============================================
- Hits           3139     3117      -22     
- Misses          453      473      +20     
- Partials        146      148       +2     

Flag	Coverage Δ
ml-commons	83.38% <ø> (-0.59%)	⬇️

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

Impacted Files	Coverage Δ
.../cluster/MLCommonsClusterManagerEventListener.java	65.62% <0.00%> (-12.50%)	⬇️
...org/opensearch/ml/cluster/DiscoveryNodeHelper.java	89.39% <0.00%> (-9.10%)	⬇️
...n/java/org/opensearch/ml/cluster/MLSyncUpCron.java	87.50% <0.00%> (-6.25%)	⬇️
.../ml/action/syncup/TransportSyncUpOnNodeAction.java	85.71% <0.00%> (-4.09%)	⬇️
...ain/java/org/opensearch/ml/task/MLTaskManager.java	59.39% <0.00%> (-2.54%)	⬇️

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