Complete keyword changes for star tree

[bharath-techie]

Description

This PR adds support for keyword fields with changes end to end that includes flush, merge and file format changes.

As part of "ordered_dimensions" as part of star tree mapping , users can provide keyword fields as well now. [ Metrics are not supported for keyword, its still "numeric-only" supported for star tree]

Related Issues

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

Check List

• Functionality includes testing.
• API changes companion pull request created, if applicable.
• Public documentation issue/PR created, if applicable.

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❌ Gradle check result for bbb9ed0: FAILURE

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❌ Gradle check result for a48de57: FAILURE

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✅ Gradle check result for 9238f17: SUCCESS

[codecov]

Codecov Report

Attention: Patch coverage is 81.36201% with 52 lines in your changes missing coverage. Please review.

Project coverage is 72.05%. Comparing base (dc8a435) to head (5a5e8af).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
...site/composite912/Composite912DocValuesWriter.java	73.33%	6 Missing and 2 partials ⚠️
...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 ⚠️
...org/apache/lucene/index/DocValuesProducerUtil.java	25.00%	2 Missing and 1 partial ⚠️
...tils/iterator/SortedSetStarTreeValuesIterator.java	66.66%	3 Missing ⚠️
...site/composite912/Composite912DocValuesReader.java	90.00%	0 Missing and 1 partial ⚠️
... and 1 more

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #16233      +/-   ##
============================================
+ Coverage     71.96%   72.05%   +0.09%     
- Complexity    64791    64931     +140     
============================================
  Files          5307     5312       +5     
  Lines        302714   302946     +232     
  Branches      43733    43764      +31     
============================================
+ Hits         217836   218290     +454     
+ Misses        67013    66817     -196     
+ Partials      17865    17839      -26     

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❌ Gradle check result for 7b3d88d: FAILURE

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[bharath-techie]

This PR is missing 2.18 , so I have merged the fixes that were done as part of this PR as part of 2.18.

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