[Backport 2.x] Remove resource usages object from search response headers

[opensearch-trigger-bot]

Backport 80ca32f from #16532.

[github-actions]

❌ Gradle check result for d8ff817: 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?

[github-actions]

❌ Gradle check result for d8ff817: 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?

[github-actions]

❕ Gradle check result for d8ff817: UNSTABLE

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

All modified and coverable lines are covered by tests ✅

Project coverage is 71.79%. Comparing base (bdb725d) to head (d8ff817).
Report is 2 commits behind head on 2.x.

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x   #16536      +/-   ##
============================================
- Coverage     71.90%   71.79%   -0.12%     
+ Complexity    65421    65385      -36     
============================================
  Files          5312     5312              
  Lines        305004   305011       +7     
  Branches      44440    44440              
============================================
- Hits         219319   218968     -351     
- Misses        67401    67802     +401     
+ Partials      18284    18241      -43     

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