[Backport 2.5] fix bwc bug when incrementing to OS 2.6.0 (#705)

[b4sjoo]

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

Description

This is a manually backport for PR #705

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 #708 (2b33a96) into 2.5 (d292e94) will increase coverage by 0.21%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                2.5     #708      +/-   ##
============================================
+ Coverage     83.97%   84.18%   +0.21%     
- Complexity     1033     1035       +2     
============================================
  Files            99       99              
  Lines          3738     3738              
  Branches        344      344              
============================================
+ Hits           3139     3147       +8     
+ Misses          453      445       -8     
  Partials        146      146              

Flag	Coverage Δ
ml-commons	84.18% <ø> (+0.21%)	⬆️

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

Impacted Files	Coverage Δ
...ain/java/org/opensearch/ml/task/MLTaskManager.java	65.98% <0.00%> (+4.06%)	⬆️

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