[Backport 3.6] Fix flaky org.opensearch.http.netty4.Netty4HttpRequestSizeLimitIT.testDoesNotLimitExcludedRequests test case

[opensearch-trigger-bot]

Backport 0d31e28 from #21565.

[github-actions]

❌ Gradle check result for 0996045: 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 0996045: SUCCESS

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.11%. Comparing base (e2270fc) to head (0996045).
⚠️ Report is 12 commits behind head on 3.6.

Additional details and impacted files

@@             Coverage Diff              @@
##                3.6   #21571      +/-   ##
============================================
- Coverage     73.15%   73.11%   -0.05%     
+ Complexity    72554    72526      -28     
============================================
  Files          5848     5837      -11     
  Lines        331985   331901      -84     
  Branches      47949    47934      -15     
============================================
- Hits         242873   242678     -195     
- Misses        69595    69712     +117     
+ Partials      19517    19511       -6     

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[opensearch-trigger-bot]

The backport to 2.19 failed:

The process '/usr/bin/git' failed with exit code 128

To backport manually, run these commands in your terminal:

# Navigate to the root of your repository
cd $(git rev-parse --show-toplevel)
# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add ../.worktrees/OpenSearch/backport-2.19 2.19
# Navigate to the new working tree
pushd ../.worktrees/OpenSearch/backport-2.19
# Create a new branch
git switch --create backport/backport-21571-to-2.19
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 278de8f75ae2efa917dcfcbd8354b2a01bebf352
# Push it to GitHub
git push --set-upstream origin backport/backport-21571-to-2.19
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/OpenSearch/backport-2.19

Then, create a pull request where the base branch is 2.19 and the compare/head branch is backport/backport-21571-to-2.19.