Remove searchSegmentOrderReversed from IndexSettings

[andrross]

This property is unused now and can be safely removed.

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: ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/20630/
• CommitID: 879a29b
  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?

[andrross]

Gradle Check (Jenkins) Run Completed with:

* **RESULT:**  ❌

* **URL:** https://build.ci.opensearch.org/job/gradle-check/20630/

* **CommitID:** [879a29b](https://github.com/opensearch-project/OpenSearch/commit/879a29bff06c720ed6a712ee4cf4d8fccda21829)
  Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green.
  Is the failure [a flaky test](https://github.com/opensearch-project/OpenSearch/blob/main/DEVELOPER_GUIDE.md#flaky-tests) unrelated to your change?

The build actually succeeded here. It seems like there was a brief outage of the Jenkins API server that caused the github action to fail while checking the status.

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: UNSTABLE ❕
• TEST FAILURES:

      1 org.opensearch.indices.replication.SegmentReplicationRelocationIT.testPrimaryRelocationWithSegRepFailure

• URL: https://build.ci.opensearch.org/job/gradle-check/20681/
• CommitID: 3f34bb6
  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]

Codecov Report

Merging #8808 (3f34bb6) into main (3adde3a) will decrease coverage by 0.10%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##               main    #8808      +/-   ##
============================================
- Coverage     70.95%   70.85%   -0.10%     
+ Complexity    57202    57164      -38     
============================================
  Files          4771     4771              
  Lines        270271   270268       -3     
  Branches      39506    39506              
============================================
- Hits         191776   191508     -268     
- Misses        62336    62615     +279     
+ Partials      16159    16145      -14     

Impacted Files	Coverage Δ
.../main/java/org/opensearch/index/IndexSettings.java	85.75% <ø> (+0.64%)	⬆️

... and 448 files with indirect coverage changes