[Backport 2.x] [Extensions] Adding extensions to experimental list of features in opensearch.yml

[opensearch-trigger-bot]

Backport 5f81930 from #6694.

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/12570/
• CommitID: a8ca84d
  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?

[owaiskazi19]

Raised #6732 for the below error

* What went wrong:
Execution failed for task ':distribution:bwc:maintenance:buildBwcLinuxTar'.
> Building 1.3.9 didn't generate expected file /var/jenkins/workspace/gradle-check/search/distribution/bwc/maintenance/build/bwc/checkout-1.3/distribution/archives/linux-tar/build/distributions/opensearch-min-1.3.9-SNAPSHOT-linux-x64.tar.gz

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/12598/
• CommitID: a8ca84d
  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/12728/
• CommitID: a8ca84d
  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/12735/
• CommitID: a8ca84d
  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?

[saratvemulapalli]

Sounds like a rebase is needed.

[codecov-commenter]

Codecov Report

Merging #6731 (e2c29ae) into 2.x (7ea7792) will decrease coverage by 0.06%.
The diff coverage is n/a.

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@@             Coverage Diff              @@
##                2.x    #6731      +/-   ##
============================================
- Coverage     70.38%   70.32%   -0.06%     
+ Complexity    59446    59378      -68     
============================================
  Files          4806     4806              
  Lines        285284   285284              
  Branches      41471    41471              
============================================
- Hits         200793   200640     -153     
- Misses        67692    67886     +194     
+ Partials      16799    16758      -41     

see 485 files with indirect coverage changes

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[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: UNSTABLE ❕
• TEST FAILURES:

      1 org.opensearch.snapshots.DedicatedClusterSnapshotRestoreIT.testIndexDeletionDuringSnapshotCreationInQueue
      1 org.opensearch.backwards.MixedClusterClientYamlTestSuiteIT.test {p0=pit/10_basic/Delete all}

• URL: https://build.ci.opensearch.org/job/gradle-check/12763/
• CommitID: e2c29ae
  Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.