[Backport 2.x] Enable must_exist parameter for update aliases API (#11210)

[gaobinlong]

Description

Backport #11210 to 2.x.

Related Issues

#2949

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Failing checks are inspected and point to the corresponding known issue(s) (See: Troubleshooting Failing Builds)
• Commits are signed per the DCO using --signoff
• Commit changes are listed out in CHANGELOG.md file (See: Changelog)
• Public documentation issue/PR created

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For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[github-actions]

❌ Gradle check result for 46b94a0: null

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]

Compatibility status:

Checks if related components are compatible with change ca113ea

Incompatible components

Skipped components

Compatible components

Compatible components: [https://github.com/opensearch-project/observability.git, https://github.com/opensearch-project/security-analytics.git, https://github.com/opensearch-project/notifications.git, https://github.com/opensearch-project/job-scheduler.git, https://github.com/opensearch-project/custom-codecs.git, https://github.com/opensearch-project/geospatial.git, https://github.com/opensearch-project/sql.git, https://github.com/opensearch-project/cross-cluster-replication.git, https://github.com/opensearch-project/asynchronous-search.git, https://github.com/opensearch-project/security.git, https://github.com/opensearch-project/ml-commons.git, https://github.com/opensearch-project/reporting.git, https://github.com/opensearch-project/anomaly-detection.git, https://github.com/opensearch-project/index-management.git, https://github.com/opensearch-project/common-utils.git, https://github.com/opensearch-project/k-nn.git, https://github.com/opensearch-project/performance-analyzer-rca.git, https://github.com/opensearch-project/alerting.git, https://github.com/opensearch-project/performance-analyzer.git]

[github-actions]

✅ Gradle check result for 0f233c7: SUCCESS

[codecov]

Codecov Report

Attention: 14 lines in your changes are missing coverage. Please review.

Comparison is base (166ede7) 71.10% compared to head (ca113ea) 70.91%.

Files	Patch %	Lines
...n/indices/alias/TransportIndicesAliasesAction.java	16.66%	9 Missing and 1 partial ⚠️
...ion/admin/indices/alias/IndicesAliasesRequest.java	50.00%	1 Missing and 2 partials ⚠️
...a/org/opensearch/cluster/metadata/AliasAction.java	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x   #11833      +/-   ##
============================================
- Coverage     71.10%   70.91%   -0.19%     
+ Complexity    59359    59239     -120     
============================================
  Files          4889     4889              
  Lines        279808   279821      +13     
  Branches      41028    41034       +6     
============================================
- Hits         198954   198440     -514     
- Misses        64019    64525     +506     
- Partials      16835    16856      +21     

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[github-actions]

❕ Gradle check result for ca113ea: UNSTABLE

• TEST FAILURES:

      1 org.opensearch.remotestore.RemoteStoreStatsIT.testDownloadStatsCorrectnessSinglePrimarySingleReplica

Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

[gaobinlong]

There is an issue tracking the flaky test.

[gaobinlong]

@reta, please help to review this backport PR, thanks!