[Backport 2.x] Fix search.aggregation/60_empty.yml test case (fails on BWC runs)

[opensearch-trigger-bot]

Backport 17ee1ce from #8351.

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/18784/
• CommitID: c588a7d
  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.SearchWeightedRoutingIT.testStrictWeightedRoutingWithCustomString
      1 org.opensearch.remotestore.SegmentReplicationUsingRemoteStoreIT.testDropPrimaryDuringReplication

• URL: https://build.ci.opensearch.org/job/gradle-check/18807/
• CommitID: c588a7d
  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 #8374 (c588a7d) into 2.x (07a0b67) will increase coverage by 0.21%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                2.x    #8374      +/-   ##
============================================
+ Coverage     70.53%   70.74%   +0.21%     
- Complexity    56860    56984     +124     
============================================
  Files          4714     4714              
  Lines        269657   269657              
  Branches      39863    39863              
============================================
+ Hits         190191   190768     +577     
+ Misses        63101    62456     -645     
- Partials      16365    16433      +68     

see 481 files with indirect coverage changes