[BACKPORT PR[ remainig sdk client changes for search (#3522)

[dhrubo-os]

Signed-off-by: Dhrubo Saha [email protected]
(cherry picked from commit 5432f25)

Description

[Describe what this change achieves]

Related Issues

Resolves #[Issue number to be closed when this PR is merged]

Check List

• New functionality includes testing.
• New functionality has been documented.
• API changes companion pull request created.
• Commits are signed per the DCO using --signoff.
• Public documentation issue/PR created.

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[codecov]

Codecov Report

Attention: Patch coverage is 80.28169% with 14 lines in your changes missing coverage. Please review.

Please upload report for BASE (2.19@f9a8a70). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
.../opensearch/ml/action/handler/MLSearchHandler.java	80.00%	8 Missing and 2 partials ⚠️
...h/ml/action/agents/TransportSearchAgentAction.java	80.00%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             2.19    #3536   +/-   ##
=======================================
  Coverage        ?   80.27%           
  Complexity      ?     6914           
=======================================
  Files           ?      610           
  Lines           ?    30138           
  Branches        ?     3366           
=======================================
  Hits            ?    24192           
  Misses          ?     4493           
  Partials        ?     1453           

Flag	Coverage Δ
ml-commons	80.27% <80.28%> (?)

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