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https://issues.apache.org/jira/browse/LUCENE-1721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12727610#action_12727610 ]
Michael McCandless commented on LUCENE-1721:
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Right, a merge can commit at any time.
Since a writer can change docIDs at any time, it's never safe for something outside to hold onto docIDs; this is what's good about delete by Term and by Query: they are "late binding", ie, only resolve to docID at the exact moment deletion is done.
> IndexWriter to allow deletion by doc ids
> ----------------------------------------
>
> Key: LUCENE-1721
> URL:
https://issues.apache.org/jira/browse/LUCENE-1721> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Reporter: Shay Banon
>
> It would be great if IndexWriter would allow for deletion by doc ids as well. It makes sense for cases where a "query" has been executed beforehand, and later, that query needs to be applied in order to delete the matched documents.
> More information here:
http://www.nabble.com/Delete-by-docId-in-IndexWriter-td24239930.html--
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