[Backport 2.x] [Feature to main] Explainability in hybrid query

[opensearch-trigger-bot]

Backport 393d49a from #1014

[codecov]

Codecov Report

Attention: Patch coverage is 56.19835% with 106 lines in your changes missing coverage. Please review.

Project coverage is 78.62%. Comparing base (80f9c0a) to head (69104ce).
Report is 1 commits behind head on 2.x.

Files with missing lines	Patch %	Lines
...ralsearch/processor/combination/ScoreCombiner.java	10.00%	26 Missing and 1 partial ⚠️
...arch/processor/NormalizationProcessorWorkflow.java	43.18%	24 Missing and 1 partial ⚠️
...r/normalization/L2ScoreNormalizationTechnique.java	5.88%	16 Missing ⚠️
...rmalization/MinMaxScoreNormalizationTechnique.java	63.63%	10 Missing and 2 partials ⚠️
...ensearch/neuralsearch/query/HybridQueryWeight.java	50.00%	6 Missing and 3 partials ⚠️
...neuralsearch/processor/NormalizationProcessor.java	73.33%	3 Missing and 1 partial ⚠️
...search/processor/ExplanationResponseProcessor.java	92.68%	0 Missing and 3 partials ⚠️
...earch/processor/normalization/ScoreNormalizer.java	0.00%	3 Missing ⚠️
...search/processor/explain/ExplainableTechnique.java	0.00%	2 Missing ⚠️
...search/neuralsearch/processor/CompoundTopDocs.java	88.88%	1 Missing ⚠️
... and 4 more

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x    #1023      +/-   ##
============================================
- Coverage     80.49%   78.62%   -1.87%     
- Complexity     1002     1030      +28     
============================================
  Files            78       85       +7     
  Lines          3419     3630     +211     
  Branches        580      607      +27     
============================================
+ Hits           2752     2854     +102     
- Misses          425      526     +101     
- Partials        242      250       +8     

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