[Backport 2.x] Complete keyword changes for star tree

[opensearch-trigger-bot]

Backport 7f27ddc from #16233.

[github-actions]

✅ Gradle check result for 0bc47e0: SUCCESS

[codecov]

Codecov Report

Attention: Patch coverage is 83.83459% with 43 lines in your changes missing coverage. Please review.

Project coverage is 71.99%. Comparing base (fa08247) to head (0bc47e0).
Report is 1 commits behind head on 2.x.

Files with missing lines	Patch %	Lines
...be/startree/utils/SequentialDocValuesIterator.java	52.94%	3 Missing and 5 partials ⚠️
...ndex/compositeindex/datacube/DimensionFactory.java	33.33%	4 Missing and 2 partials ⚠️
...be/startree/fileformats/meta/StarTreeMetadata.java	57.14%	5 Missing and 1 partial ⚠️
...rtree/fileformats/meta/StarTreeMetadataWriter.java	45.45%	5 Missing and 1 partial ⚠️
...ndex/compositeindex/datacube/KeywordDimension.java	73.68%	5 Missing ⚠️
...datacube/startree/builder/BaseStarTreeBuilder.java	94.73%	2 Missing and 3 partials ⚠️
...eindex/datacube/startree/index/StarTreeValues.java	81.25%	0 Missing and 3 partials ⚠️
...tils/iterator/SortedSetStarTreeValuesIterator.java	66.66%	3 Missing ⚠️
...site/composite912/Composite912DocValuesWriter.java	95.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x   #17110      +/-   ##
============================================
+ Coverage     71.91%   71.99%   +0.08%     
- Complexity    65716    65799      +83     
============================================
  Files          5322     5325       +3     
  Lines        306214   306417     +203     
  Branches      44655    44681      +26     
============================================
+ Hits         220206   220615     +409     
+ Misses        67630    67408     -222     
- Partials      18378    18394      +16     

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