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https://issues.apache.org/jira/browse/LUCENE-8246?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16432498#comment-16432498
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Michael McCandless commented on LUCENE-8246:
--------------------------------------------

+1

> Allow to customize the number of deletes a merge claims
> -------------------------------------------------------
>
>                 Key: LUCENE-8246
>                 URL: https://issues.apache.org/jira/browse/LUCENE-8246
>             Project: Lucene - Core
>          Issue Type: Improvement
>    Affects Versions: 7.4, master (8.0)
>            Reporter: Simon Willnauer
>            Priority: Major
>             Fix For: 7.4, master (8.0)
>
>         Attachments: LUCENE-8246.patch
>
>
> With the introduction of soft deletes no every merge claims all documents 
> that are marked as deleted in the segment readers. MergePolicies still need 
> to do accurate accounting in order to select segments for merging and need to 
> decide if segments are merged. This chance allows the merge policy to 
> customize the number of deletes a merge of a segment claims.



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