Update 2.x to 2.19.0 (since 2.18.0 was cut)

[reta]

Description

Update 2.x to 2.19.0 (since 2.18.0 was cut)

Related Issues

N/A

Check List

• Functionality includes testing.
• API changes companion pull request created, if applicable.
• Public documentation issue/PR created, if applicable.

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[github-actions]

❕ Gradle check result for c7ae7a5: UNSTABLE

• TEST FAILURES:

      1 org.opensearch.gateway.RecoveryFromGatewayIT.testNBatchesCreationAndAssignment

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 71.78%. Comparing base (d919fc5) to head (c7ae7a5).
Report is 1 commits behind head on 2.x.

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x   #16465      +/-   ##
============================================
+ Coverage     71.76%   71.78%   +0.02%     
- Complexity    65317    65362      +45     
============================================
  Files          5312     5312              
  Lines        304992   304993       +1     
  Branches      44440    44440              
============================================
+ Hits         218878   218941      +63     
- Misses        67819    67821       +2     
+ Partials      18295    18231      -64     

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[reta]

Thanks @dbwiddis , we may need to get #16455 in first, otherwise we won't be able to get main checks green