[Backport 2.x] wlm stats fix

[kaushalmahi12]

Backport 2.x for #16278.

[github-actions]

❌ Gradle check result for a0764bc: FAILURE

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?

[jainankitk]

Unrelated failure, retrying gradle check:

[Test Result](https://build.ci.opensearch.org/job/gradle-check/49268/testReport/) (1 failure / ±0)

    [org.opensearch.search.query.QueryPhaseTests.testQueryTimeoutChecker {p0=5 p1=org.opensearch.search.query.ConcurrentQueryPhaseSearcher@1ba7db2a}](https://build.ci.opensearch.org/job/gradle-check/49268/testReport/junit/org.opensearch.search.query/QueryPhaseTests/testQueryTimeoutChecker__p0_5_p1_org_opensearch_search_query_ConcurrentQueryPhaseSearcher_1ba7db2a_/)

[github-actions]

✅ Gradle check result for a0764bc: SUCCESS

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.72%. Comparing base (589f42c) to head (a0764bc).
Report is 4 commits behind head on 2.x.

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x   #16280      +/-   ##
============================================
+ Coverage     71.71%   71.72%   +0.01%     
- Complexity    64985    65019      +34     
============================================
  Files          5296     5302       +6     
  Lines        303765   303866     +101     
  Branches      44182    44192      +10     
============================================
+ Hits         217848   217958     +110     
+ Misses        67800    67779      -21     
- Partials      18117    18129      +12     

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