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https://issues.apache.org/jira/browse/LUCENE-2887?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12985967#action_12985967
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Andrzej Bialecki commented on LUCENE-2887:
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The MultiPassIndexSplitter won't work without this API. It can be modified to
use a subclass of IndexReader & term / postings enumerators to restore the
current behavior, or it can be rewritten entirely as a (fabled)
SinglePassIndexSplitter. ;)
> Remove/deprecate IndexReader.undeleteAll
> ----------------------------------------
>
> Key: LUCENE-2887
> URL: https://issues.apache.org/jira/browse/LUCENE-2887
> Project: Lucene - Java
> Issue Type: Improvement
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 3.1
>
>
> This API is rather dangerous in that it's "best effort" since it can only
> un-delete docs that have not yet been merged away, or, dropped (as of
> LUCENE-2010).
> Given that it exposes impl details of how Lucene prunes deleted docs, I think
> we should remove this API.
> Are there legitimate use cases....?
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