Porting different Backward incompatible changes happened in Core to 2.x branch

[navneet1v]

Description

Porting different Backward incompatible changes happened in Core to 2.x branch

Issues Resolved

NA

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed as per the DCO using --signoff

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.

[codecov]

Codecov Report

Merging #253 (a6962db) into 2.x (5228fc7) will not change coverage.
Report is 5 commits behind head on 2.x.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##                2.x     #253   +/-   ##
=========================================
  Coverage     89.55%   89.55%           
  Complexity      103      103           
=========================================
  Files             7        7           
  Lines           316      316           
  Branches         52       52           
=========================================
  Hits            283      283           
  Misses           16       16           
  Partials         17       17           

Files Changed	Coverage Δ
...earch/neuralsearch/ml/MLCommonsClientAccessor.java	92.00% <ø> (ø)
...g/opensearch/neuralsearch/plugin/NeuralSearch.java	0.00% <ø> (ø)
...nsearch/neuralsearch/query/NeuralQueryBuilder.java	87.91% <ø> (ø)
...neuralsearch/processor/TextEmbeddingProcessor.java	92.85% <100.00%> (ø)