[Backport 2.x] Allow setting KEYSTORE_PASSWORD through env variable (#12865)

[cwperks]

Backport #12865 to 2.x

[github-actions]

Compatibility status:

Checks if related components are compatible with change c061f77

Incompatible components

Skipped components

Compatible components

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

[reta]

@cwperks could you please push DCO fix? thank you

[github-actions]

❌ Gradle check result for 1a8a6a2: 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?

[cwperks]

@cwperks could you please push DCO fix? thank you

Fixed.

[github-actions]

❌ Gradle check result for c061f77: 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 c061f77: FAILURE

#6542

[github-actions]

❕ Gradle check result for c061f77: UNSTABLE

• TEST FAILURES:

      1 org.opensearch.indices.replication.SegmentReplicationIT.classMethod

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 71.21%. Comparing base (0dd892c) to head (c061f77).
Report is 96 commits behind head on 2.x.

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x   #12949      +/-   ##
============================================
- Coverage     71.28%   71.21%   -0.07%     
- Complexity    60145    60447     +302     
============================================
  Files          4957     4985      +28     
  Lines        282799   284462    +1663     
  Branches      41409    41595     +186     
============================================
+ Hits         201591   202580     +989     
- Misses        64189    64778     +589     
- Partials      17019    17104      +85     

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