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https://issues.apache.org/jira/browse/LUCENE-2016?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12771565#action_12771565
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Robert Muir commented on LUCENE-2016:
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Earwin, take a look at LUCENE-2019. I added a hyperlink to the list there...
> replace invalid U+FFFF character during indexing
> ------------------------------------------------
>
> Key: LUCENE-2016
> URL: https://issues.apache.org/jira/browse/LUCENE-2016
> Project: Lucene - Java
> Issue Type: Bug
> Affects Versions: 2.4, 2.4.1, 2.9
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 2.9.1, 3.0
>
> Attachments: LUCENE-2016.patch
>
>
> If the invalid U+FFFF character is embedded in a token, it actually causes
> indexing to silently corrupt the index by writing duplicate terms into the
> terms dict. CheckIndex will catch the error, and merging will hit exceptions
> (I think).
> We already replace invalid surrogate pairs with the replacement character
> U+FFFD, so I'll just do the same with U+FFFF.
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