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https://issues.apache.org/jira/browse/LUCENE-3907?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13652878#comment-13652878
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Adrien Grand commented on LUCENE-3907:
--------------------------------------
The previous behaviour could trigger highlighting bugs so I think it is
important that we fix it in 4.x. In case the broken behaviour is still needed,
it can be emulated by providing Version.LUCENE_43 as the Lucene match version.
> Improve the Edge/NGramTokenizer/Filters
> ---------------------------------------
>
> Key: LUCENE-3907
> URL: https://issues.apache.org/jira/browse/LUCENE-3907
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Michael McCandless
> Assignee: Adrien Grand
> Labels: gsoc2013
> Fix For: 4.3
>
> Attachments: LUCENE-3907.patch
>
>
> Our ngram tokenizers/filters could use some love. EG, they output ngrams in
> multiple passes, instead of "stacked", which messes up offsets/positions and
> requires too much buffering (can hit OOME for long tokens). They clip at
> 1024 chars (tokenizers) but don't (token filters). The split up surrogate
> pairs incorrectly.
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