[Backport 2.x] Fixing the backward incompatible changes coming from core in ScoreScriptipt class(#1056)

[navneet1v]

Description

Fixing the backward incompatible changes coming from core in ScoreScriptipt class(#1056)

This change includes:

1. Fixing the backward incompatible changes in ScoreScript class. [Feature] Expose term frequency in Painless script score context OpenSearch#9081

Main branch PR: #1056

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 #1063 (8fc8758) into 2.x (8c7cb1b) will decrease coverage by 0.02%.
Report is 1 commits behind head on 2.x.
The diff coverage is 83.67%.

@@             Coverage Diff              @@
##                2.x    #1063      +/-   ##
============================================
- Coverage     85.13%   85.11%   -0.02%     
- Complexity     1148     1159      +11     
============================================
  Files           154      154              
  Lines          4702     4737      +35     
  Branches        428      434       +6     
============================================
+ Hits           4003     4032      +29     
- Misses          506      511       +5     
- Partials        193      194       +1     

Files Changed	Coverage Δ
...java/org/opensearch/knn/index/query/KNNWeight.java	85.63% <76.47%> (+<0.01%)	⬆️
...ain/java/org/opensearch/knn/index/KNNSettings.java	83.78% <80.00%> (-0.60%)	⬇️
...g/opensearch/knn/plugin/script/KNNScoreScript.java	100.00% <100.00%> (ø)
...earch/knn/plugin/script/KNNScoreScriptFactory.java	100.00% <100.00%> (ø)
.../opensearch/knn/plugin/script/KNNScoringSpace.java	93.10% <100.00%> (ø)