feat: mergeable indexes

[aatifsyed]

Summary of changes

Changes introduced in this pull request:

Reference issue to close (if applicable)

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Change checklist

• [ ] I have performed a self-review of my own code,
• [ ] I have made corresponding changes to the documentation,
• [ ] I have added tests that prove my fix is effective or that my feature works (if possible),
• [ ] I have made sure the CHANGELOG is up-to-date. All user-facing changes should be reflected in this document.