[Backport 2.x] Support for Google Application Default Credentials (#8394)

[yallen-ic]

backport #8394 to 2.x

[github-actions]

Compatibility status:

Checks if related components are compatible with change 475f7dc

Incompatible components

Incompatible components: [https://github.com/opensearch-project/cross-cluster-replication.git, https://github.com/opensearch-project/performance-analyzer.git, https://github.com/opensearch-project/performance-analyzer-rca.git]

Skipped components

Compatible components

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

[github-actions]

❌ Gradle check result for 9b1b7ea: 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?

[andrross]

I rebased and cherry-picked this commit again from main and fixed up the CHANGELOG. The DCO check is still failing, which is odd since the commit is directly cherry-picked from main. The author did sign the commit, but the signed email address doesn't match what is in the git commit metadata.

[github-actions]

❕ Gradle check result for b43ebfa: UNSTABLE

• TEST FAILURES:

      1 org.opensearch.remotestore.RemoteIndexPrimaryRelocationIT.testPrimaryRelocationWhileIndexing
      1 org.opensearch.index.shard.RemoteIndexShardTests.testNoFailuresOnFileReads

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: 3 lines in your changes are missing coverage. Please review.

Comparison is base (08bbddc) 71.05% compared to head (475f7dc) 71.15%.
Report is 1 commits behind head on 2.x.

Files	Patch %	Lines
...ories/gcs/GoogleApplicationDefaultCredentials.java	75.00%	2 Missing ⚠️
...in/java/org/opensearch/index/shard/IndexShard.java	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x   #12080      +/-   ##
============================================
+ Coverage     71.05%   71.15%   +0.10%     
- Complexity    59360    59396      +36     
============================================
  Files          4891     4892       +1     
  Lines        279982   280005      +23     
  Branches      41070    41073       +3     
============================================
+ Hits         198937   199237     +300     
+ Misses        64239    63841     -398     
- Partials      16806    16927     +121     

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[github-actions]

❕ Gradle check result for 475f7dc: UNSTABLE

• TEST FAILURES:

      1 org.opensearch.search.SearchWeightedRoutingIT.testMultiGetWithNetworkDisruption_FailOpenEnabled
      1 org.opensearch.index.shard.RemoteIndexShardTests.testNoFailuresOnFileReads

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