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https://issues.apache.org/jira/browse/LUCENE-8233?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16426721#comment-16426721
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ASF subversion and git services commented on LUCENE-8233:
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Commit fb3a4b063c955889ef6fd4d1664e8622c8378e4e in lucene-solr's branch
refs/heads/branch_7x from [~simonw]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=fb3a4b0 ]
LUCENE-8233: Use a consistent merge policy in test to make sure segment counts
match
> 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-8232.patch, 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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