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https://issues.apache.org/jira/browse/LUCENE-8198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16394673#comment-16394673
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Simon Willnauer commented on LUCENE-8198:
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I agree with you on all that. I also wonder if we can then implement "undelete"
easily which would be very beneficial. One idea would be to change the
updateDocument method to this: __
{code:java}
public long updateDocument(Term term, Iterable<? extends IndexableField> doc,
Field... dvUpdates){code}
this would be 100% bwc and would allow to do this as well. I didn't think of
such a simple way of doing it. I think the change would be very simple to
implement.
> Add ability to persist deletes across merges
> --------------------------------------------
>
> Key: LUCENE-8198
> URL: https://issues.apache.org/jira/browse/LUCENE-8198
> Project: Lucene - Core
> Issue Type: Improvement
> Affects Versions: 7.3, master (8.0)
> Reporter: Simon Willnauer
> Assignee: Simon Willnauer
> Priority: Major
> Attachments: LUCENE-8198.patch
>
>
> This allows conditionally persist deletes on a per document basis to prevent
> them from being merged away. This expert feature is useful to maintain
> history of documents in the index where otherwise a duplicate storage
> mechanism would be needed. For instance features like CouchDBs changes API
> can be build on top of persistent deletes. While using persistent deletes has
> a considerably small overhead at merge time or when deletes applied to fully
> deleted segments, there is no impact if persistent deletes are unused.
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