[Backport 2.x] Add @SuppressWarnings("removal") to not fail the build with -Werror for some JDKs

[opensearch-trigger-bot]

Backport 411b279 from #11923.

[github-actions]

Compatibility status:

Checks if related components are compatible with change 859275b

Incompatible components

Incompatible components: [https://github.com/opensearch-project/asynchronous-search.git, https://github.com/opensearch-project/observability.git, https://github.com/opensearch-project/performance-analyzer.git, https://github.com/opensearch-project/reporting.git, https://github.com/opensearch-project/performance-analyzer-rca.git, https://github.com/opensearch-project/custom-codecs.git, https://github.com/opensearch-project/anomaly-detection.git, https://github.com/opensearch-project/cross-cluster-replication.git, https://github.com/opensearch-project/sql.git]

Skipped components

Compatible components

Compatible components: [https://github.com/opensearch-project/security-analytics.git, https://github.com/opensearch-project/job-scheduler.git, https://github.com/opensearch-project/common-utils.git, https://github.com/opensearch-project/k-nn.git, https://github.com/opensearch-project/notifications.git, https://github.com/opensearch-project/geospatial.git, https://github.com/opensearch-project/ml-commons.git, https://github.com/opensearch-project/neural-search.git, https://github.com/opensearch-project/index-management.git, https://github.com/opensearch-project/alerting.git, https://github.com/opensearch-project/security.git]

[github-actions]

❌ Gradle check result for 859275b: 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?

[reta]

❌ Gradle check result for 859275b: FAILURE

#10006
#9191
#9773

[github-actions]

❕ Gradle check result for 859275b: UNSTABLE

• TEST FAILURES:

      1 org.opensearch.remotestore.RemoteStoreStatsIT.testNonZeroPrimaryStatsOnNewlyCreatedIndexWithZeroDocs
      1 org.opensearch.index.shard.RemoteStoreRefreshListenerTests.testRefreshAfterCommit
      1 org.opensearch.index.shard.RemoteStoreRefreshListenerTests.testAfterRefresh
      1 org.opensearch.index.shard.RemoteStoreRefreshListenerTests.testAfterMultipleCommits
      1 org.opensearch.index.shard.RemoteStoreRefreshListenerTests.testAfterCommit

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

Attention: 12 lines in your changes are missing coverage. Please review.

Comparison is base (c48fb55) 71.04% compared to head (859275b) 71.13%.
Report is 4 commits behind head on 2.x.

Files	Patch %	Lines
.../org/opensearch/ingest/common/RemoveProcessor.java	88.88%	3 Missing and 5 partials ⚠️
...va/org/opensearch/ingest/common/CopyProcessor.java	93.61%	3 Missing ⚠️
...g/opensearch/ingest/common/IngestCommonPlugin.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x   #11930      +/-   ##
============================================
+ Coverage     71.04%   71.13%   +0.08%     
- Complexity    59352    59373      +21     
============================================
  Files          4890     4891       +1     
  Lines        279826   279915      +89     
  Branches      41035    41050      +15     
============================================
+ Hits         198799   199113     +314     
+ Misses        64210    63929     -281     
- Partials      16817    16873      +56     

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