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https://issues.apache.org/jira/browse/LUCENE-3907?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13652770#comment-13652770
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Jack Krupansky commented on LUCENE-3907:
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Why not make the big changes for trunk/5.0, but leave the existing
filters/tokenziers in 4.x as deprecated. Add the "leading" replacements as well
in 4x, but be sure to preserve the existing stuff with support for "back" in 4x
- as deprecated.
> 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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