Set version to 2.15 for determining metadata during migration to remote store

[skumawat2025]

Description

Set version to 2.15 for determining custom metadata during migration to remote store.

Check List

• [ ] Functionality includes testing.
• [ ] API changes companion pull request created, if applicable.
• [ ] Public documentation issue/PR created, if applicable.

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[github-actions]

✅ Gradle check result for 321f021: SUCCESS

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 71.76%. Comparing base (4abcf39) to head (321f021).

Files	Patch %	Lines
.../org/opensearch/index/remote/RemoteStoreUtils.java	0.00%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #14819      +/-   ##
============================================
- Coverage     71.91%   71.76%   -0.15%     
+ Complexity    62516    62426      -90     
============================================
  Files          5145     5145              
  Lines        293307   293307              
  Branches      42407    42407              
============================================
- Hits         210919   210499     -420     
- Misses        65040    65495     +455     
+ Partials      17348    17313      -35     

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[ashking94]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 71.76%. Comparing base (4abcf39) to head (321f021).

Files Patch % Lines
.../org/opensearch/index/remote/RemoteStoreUtils.java 0.00% 0 Missing and 2 partials ⚠️
Additional details and impacted files
☔ View full report in Codecov by Sentry. 📢 Have feedback on the report? Share it here.

No change in code. The version should have been set earlier itself. Codecov warning is considering the changed lines and hence showing 0%. Going ahead with the merge.