Fix CHANGELOG after backports to 2.x

[reta]

Description

Fix CHANGELOG after backports to 2.x

Issues Resolved

N/A

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
• Commit changes are listed out in CHANGELOG.md file (See: Changelog)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[kotwanikunal]

Thanks @reta!

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: SUCCESS ✅
• URL: https://build.ci.opensearch.org/job/gradle-check/12377/
• CommitID: 4ed2e50

[codecov-commenter]

Codecov Report

Merging #6655 (4ed2e50) into main (b2b2b67) will decrease coverage by 0.09%.
The diff coverage is n/a.

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@@             Coverage Diff              @@
##               main    #6655      +/-   ##
============================================
- Coverage     70.82%   70.73%   -0.09%     
+ Complexity    59160    59120      -40     
============================================
  Files          4803     4803              
  Lines        283188   283188              
  Branches      40837    40837              
============================================
- Hits         200574   200321     -253     
- Misses        66129    66434     +305     
+ Partials      16485    16433      -52     

see 472 files with indirect coverage changes

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