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https://issues.apache.org/jira/browse/LUCENE-8198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16394680#comment-16394680
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Robert Muir commented on LUCENE-8198:
-------------------------------------
it looks reasonable. We should think about the name. I think "soft-delete" is
the only real use-case, but it looks like it can do undelete too (assuming you
store the fields etc). softUpdateDocument makes me think of freebsd filesystem
stuff...
+1 for multiple fields of updates. If you want to pay the price to keep deletes
around longer than usual in the index, you may want to log some additional
metadata (e.g. timestamp or user) that deleted it. At least timestamp is
important if you want to have a mergepolicy that converts it into a real delete
after say, 90 days, to match some retention policy or time-window to correct
mistakes.
with your api, if doc is null it will just issue the delete with no replacement
correct?
> 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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