[Backport] [2.x] Bump reactor_netty from 1.1.26 to 1.1.27 (#17322)

[reta]

Backport of #17322 to 2.x

[github-actions]

✅ Gradle check result for 534c35c: SUCCESS

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.93%. Comparing base (919076a) to head (534c35c).
Report is 6 commits behind head on 2.x.

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x   #17346      +/-   ##
============================================
+ Coverage     71.90%   71.93%   +0.02%     
- Complexity    65908    65954      +46     
============================================
  Files          5341     5341              
  Lines        307160   307147      -13     
  Branches      44824    44825       +1     
============================================
+ Hits         220872   220944      +72     
+ Misses        67871    67775      -96     
- Partials      18417    18428      +11     

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[opensearch-trigger-bot]

The backport to 2.19.1 failed:

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

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add ../.worktrees/backport-2.19.1 2.19.1
# Navigate to the new working tree
pushd ../.worktrees/backport-2.19.1
# Create a new branch
git switch --create backport/backport-17346-to-2.19.1
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 63eb4ed4b3199f42bbcb9ec7c088afb1e99e7fac
# Push it to GitHub
git push --set-upstream origin backport/backport-17346-to-2.19.1
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/backport-2.19.1

Then, create a pull request where the base branch is 2.19.1 and the compare/head branch is backport/backport-17346-to-2.19.1.