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SOLR-18190: Index upgrade Collection level API#4245

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rahulgoswami wants to merge 6 commits intoapache:mainfrom
Commvault:index-upgrade-collections-api
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SOLR-18190: Index upgrade Collection level API#4245
rahulgoswami wants to merge 6 commits intoapache:mainfrom
Commvault:index-upgrade-collections-api

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@rahulgoswami rahulgoswami commented Mar 29, 2026

https://issues.apache.org/jira/browse/SOLR-18190

Description

A new Collections API (UPGRADECOLLECTIONINDEX) to upgrade an older index to the current underlying Lucene version. This is to facilitate upgrading to a future Solr version without needing to recreate the index from source.

Solution

Detailed design available in the JIRA

AI agent disclosure: Design is mine. Coding heavily assisted by Claude Code and Codex with regular intermittent manual reviews and corrections. Will give a final manual pass before opening the PR for review.

@rahulgoswami rahulgoswami marked this pull request as draft March 29, 2026 04:01
@rahulgoswami rahulgoswami changed the title Index upgrade Collections api Index upgrade Collections API Mar 29, 2026
@rahulgoswami rahulgoswami changed the title Index upgrade Collections API Index upgrade Collection level API Mar 29, 2026
@rahulgoswami rahulgoswami changed the title Index upgrade Collection level API SOLR-18190: Index upgrade Collection level API Apr 3, 2026
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