[Backport 2.x] [Refactor] Remove CollectionUtils.sortAndDedup and use java TreeSet instead of hppc ObjectArrayList

[opensearch-trigger-bot]

Backport 4859e15 from #6884.

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/13121/
• CommitID: 5353baa
  Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green.
  Is the failure a flaky test unrelated to your change?

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/13159/
• CommitID: 5353baa
  Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green.
  Is the failure a flaky test unrelated to your change?

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: UNSTABLE ❕
• TEST FAILURES:

      1 org.opensearch.backwards.MixedClusterClientYamlTestSuiteIT.test {p0=indices.shrink/30_copy_settings/Copy settings during shrink index}

• URL: https://build.ci.opensearch.org/job/gradle-check/13207/
• CommitID: 5353baa
  Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

[codecov-commenter]

Codecov Report

Merging #6902 (5353baa) into 2.x (ac79a63) will decrease coverage by 0.12%.
The diff coverage is 43.57%.

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@@             Coverage Diff              @@
##                2.x    #6902      +/-   ##
============================================
- Coverage     70.41%   70.30%   -0.12%     
+ Complexity    59480    59437      -43     
============================================
  Files          4810     4811       +1     
  Lines        285453   285537      +84     
  Branches      41503    41508       +5     
============================================
- Hits         200993   200735     -258     
- Misses        67704    68037     +333     
- Partials      16756    16765       +9     

Impacted Files	Coverage Δ
...ark/store/remote/filecache/FileCacheBenchmark.java	0.00% <0.00%> (ø)
...pensearch/ingest/useragent/UserAgentProcessor.java	63.41% <ø> (ø)
.../index/reindex/AbstractBaseReindexRestHandler.java	6.66% <ø> (+0.69%)	⬆️
...on/admin/indices/forcemerge/ForceMergeRequest.java	48.71% <0.00%> (-4.06%)	⬇️
...ensearch/index/mapper/ParametrizedFieldMapper.java	98.59% <ø> (ø)
.../java/org/opensearch/index/mapper/TypeParsers.java	81.39% <ø> (ø)
...main/java/org/opensearch/rest/BaseRestHandler.java	69.33% <0.00%> (-7.14%)	⬇️
...rest/action/admin/indices/RestOpenIndexAction.java	34.78% <0.00%> (-22.37%)	⬇️
...va/org/opensearch/index/mapper/MapperTestCase.java	95.33% <ø> (ø)
...g/opensearch/test/rest/OpenSearchRestTestCase.java	3.93% <ø> (ø)
... and 11 more

... and 466 files with indirect coverage changes

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