fix bwc bug when incrementing to OS 2.6.0

[b4sjoo]

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

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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[ylwu-amzn]

Change "plugins.ml_commons.only_run_on_ml_node" to false in BWC test?

org.opensearch.ml.bwc.MLCommonsBackwardsCompatibilityIT > testBackwardsCompatibility FAILED
    org.opensearch.client.ResponseException: method [POST], host [http://[::1]:42291], URI [/_plugins/_ml/_train_predict/kmeans], status line [HTTP/1.1 500 Internal Server Error]
    {"error":{"root_cause":[{"type":"m_l_resource_not_found_exception","reason":"no eligible node found, ml node is required to run this request"}],"type":"m_l_resource_not_found_exception","reason":"no eligible node found, ml node is required to run this request"},"status":500}

[codecov-commenter]

Codecov Report

Merging #698 (741a1e6) into 2.x (83a7d4f) will decrease coverage by 0.11%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                2.x     #698      +/-   ##
============================================
- Coverage     83.49%   83.38%   -0.11%     
+ Complexity     1021     1019       -2     
============================================
  Files            99       99              
  Lines          3738     3738              
  Branches        344      344              
============================================
- Hits           3121     3117       -4     
- Misses          470      473       +3     
- Partials        147      148       +1     

Flag	Coverage Δ
ml-commons	83.38% <ø> (-0.11%)	⬇️

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%)	⬇️
.../java/org/opensearch/ml/task/MLTaskDispatcher.java	32.94% <0.00%> (ø)

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[b4sjoo]

This PR is closed because we opened PR #705 for a cleaner look.