vigyasharma opened a new pull request #633:
URL: https://github.com/apache/lucene/pull/633


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   # Description
   
   > _Work in Progress PR to share approach and get early feedback on changes_
   
   The addIndexes(CodecReader...) API today merges all provided readers into a 
single merge, in one large blocking call. We want to add concurrency here by 
invoking multiple parallel merges on subsets of readers, in a way that is 
configurable by users. The merged segments created, can later be merged further 
in the regular, non-blocking, background merges triggered by Lucene. Currently, 
users are responsible  for managing their API run times, by invoking it 
multiple times with subsets of readers. 
   JIRA - https://issues.apache.org/jira/browse/LUCENE-10216
   
   
   # Solution
   
   In this change, we leverage the configured MergeScheduler to invoke all 
merges required by the addIndexes API. MergePolicy also exposes a 
`findMerges(List<CodecReader> readers)` API that users can override to 
configure how their readers should be clustered into merges. We add a default 
implementation that retains current behavior of adding all readers into a 
single merge.
   
   
   # Tests
   
   - Existing tests passing
   - Pending: New tests to be added
   
   # Checklist
   
   Please review the following and check all that apply:
   
   - [ ] I have reviewed the guidelines for [How to 
Contribute](https://wiki.apache.org/lucene/HowToContribute) and my code 
conforms to the standards described there to the best of my ability.
   - [ ] I have created a Jira issue and added the issue ID to my pull request 
title.
   - [ ] I have given Lucene maintainers 
[access](https://help.github.com/en/articles/allowing-changes-to-a-pull-request-branch-created-from-a-fork)
 to contribute to my PR branch. (optional but recommended)
   - [ ] I have developed this patch against the `main` branch.
   - [ ] I have run `./gradlew check`.
   - [ ] I have added tests for my changes.
   


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