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https://issues.apache.org/jira/browse/LUCENE-8233?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16424007#comment-16424007
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Michael McCandless commented on LUCENE-8233:
--------------------------------------------

+1; this is a simple way to expose soft deletes.  I left a few comments on 
github that Simon already addressed!

>  Add support for soft deletes to IndexWriter delete accounting
> --------------------------------------------------------------
>
>                 Key: LUCENE-8233
>                 URL: https://issues.apache.org/jira/browse/LUCENE-8233
>             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-8233.patch, LUCENE-8233.patch, LUCENE-8233.patch
>
>
> This change adds support for soft deletes as a fully supported feature by the 
> index writer. Soft deletes are accounted for inside the index writer and 
> therefor also by merge policies.
>     
> This change also adds a SoftDeletesRetentionMergePolicy that allows users to 
> selectively carry over soft_deleted document across merges for retention 
> policies. The merge policy selects documents that should be kept around in 
> the merged segment based on a user provided query.



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