Introduce remote store hash algorithm in customData in IndexMetadata

[ashking94]

Description

This PR is a sub task of feature request #12567 and being tracked in meta issue - #12589.

This PR consists refactoring to introduce path_hash_algorithm in remote_store customData in IndexMetadata. This will allow user to change the hashing algorithm used for generating the optimised remote store prefix once we add more algorithms. We also add FNV1a hash which we are planning to use for generating hashes for remote store optimised prefix.

Related Issues

Resolves #12985

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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[github-actions]

Compatibility status:

Checks if related components are compatible with change a91ed4d

Incompatible components

Skipped components

Compatible components

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

[github-actions]

✅ Gradle check result for 631694e: SUCCESS

[codecov]

Codecov Report

Attention: Patch coverage is 86.90476% with 22 lines in your changes are missing coverage. Please review.

Project coverage is 71.41%. Comparing base (b15cb0c) to head (a91ed4d).
Report is 107 commits behind head on main.

Files	Patch %	Lines
.../org/opensearch/index/remote/RemoteStoreEnums.java	77.08%	11 Missing ⚠️
...h/cluster/metadata/MetadataCreateIndexService.java	80.00%	1 Missing and 1 partial ⚠️
.../main/java/org/opensearch/index/IndexSettings.java	71.42%	0 Missing and 2 partials ⚠️
...ensearch/index/remote/RemoteStorePathStrategy.java	94.59%	1 Missing and 1 partial ⚠️
...rc/main/java/org/opensearch/common/hash/FNV1a.java	92.30%	1 Missing ⚠️
...c/main/java/org/opensearch/index/IndexService.java	0.00%	1 Missing ⚠️
...in/java/org/opensearch/index/shard/IndexShard.java	50.00%	1 Missing ⚠️
...ndex/store/RemoteSegmentStoreDirectoryFactory.java	94.44%	0 Missing and 1 partial ⚠️
...rg/opensearch/index/translog/RemoteFsTranslog.java	94.44%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #12986      +/-   ##
============================================
- Coverage     71.42%   71.41%   -0.01%     
- Complexity    59978    60331     +353     
============================================
  Files          4985     5022      +37     
  Lines        282275   284178    +1903     
  Branches      40946    41157     +211     
============================================
+ Hits         201603   202937    +1334     
- Misses        63999    64399     +400     
- Partials      16673    16842     +169     

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[github-actions]

❕ Gradle check result for a91ed4d: UNSTABLE

• TEST FAILURES:

      1 org.opensearch.remotestore.multipart.RemoteStoreMultipartIT.testAsyncDurabilityThrowsExceptionWhenRestrictSettingTrue

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