fixing input validation in segments and delete pit request

[bharath-techie]

Description

Before:
If same PIT ID is sent multiple times as part of delete list or pit segments list, then its processed multiple times.

After this change:
Only the unique PIT IDs are sent from rest layer to transport layer

Issues Resolved

[List any issues this PR will resolve]

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed per the DCO using --signoff
• Commit changes are listed out in CHANGELOG.md file (See: Changelog)

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.

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/12329/
• CommitID: 44955ce
  Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green.
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[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: SUCCESS ✅
• URL: https://build.ci.opensearch.org/job/gradle-check/12328/
• CommitID: a98fb77

[codecov-commenter]

Codecov Report

Merging #6645 (d49d0e5) into main (89edd55) will increase coverage by 0.02%.
The diff coverage is 81.81%.

@@             Coverage Diff              @@
##               main    #6645      +/-   ##
============================================
+ Coverage     70.66%   70.68%   +0.02%     
- Complexity    56070    56143      +73     
============================================
  Files          4680     4680              
  Lines        266071   266073       +2     
  Branches      39072    39070       -2     
============================================
+ Hits         188025   188086      +61     
- Misses        62065    62072       +7     
+ Partials      15981    15915      -66     

Impacted Files	Coverage Δ
...pensearch/action/search/TransportSearchAction.java	70.99% <0.00%> (+0.43%)	⬆️
...n/indices/segments/TransportPitSegmentsAction.java	69.49% <66.66%> (ø)
...search/action/search/TransportDeletePitAction.java	100.00% <100.00%> (ø)
...nsearch/search/pipeline/SearchPipelineService.java	83.88% <100.00%> (+1.11%)	⬆️

... and 456 files with indirect coverage changes

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/12330/
• CommitID: 3d1b15a
  Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green.
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[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/16143/
• CommitID: 62fec63
  Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green.
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[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/16144/
• CommitID: 5a60bec
  Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green.
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[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/16148/
• CommitID: c5410bb
  Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green.
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[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/16149/
• CommitID: 3072b8e
  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/16150/
• CommitID: c39f550
  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/16165/
• CommitID: a06440b
  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: SUCCESS ✅
• URL: https://build.ci.opensearch.org/job/gradle-check/16223/
• CommitID: 991de84

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/16225/
• CommitID: c39f550
  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/16227/
• CommitID: 197cbec
  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.search.backpressure.SearchBackpressureIT.testSearchShardTaskCancellationWithHighCpu

• URL: https://build.ci.opensearch.org/job/gradle-check/16240/
• CommitID: 197cbec
  Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: UNSTABLE ❕
• TEST FAILURES:

      1 org.opensearch.search.backpressure.SearchBackpressureIT.testSearchShardTaskCancellationWithHighCpu

• URL: https://build.ci.opensearch.org/job/gradle-check/16283/
• CommitID: d49d0e5
  Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.