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https://issues.apache.org/jira/browse/LUCENE-5012?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13667419#comment-13667419
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Michael McCandless commented on LUCENE-5012:
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I committed some changes:
* Got charFilter working
* Fixed a few bugs in SynFilterStage not clearing it's state on end
/ reset
* Created a new fun stage: InsertDeletedPunctuationStage. This
stage detects when a tokenizer has skipped over punctuation chars
and inserts a deleted token representing the punctuation, e.g. to
prevent a synonym or phrase query from matching over the
punctuation. I had previously thought we would need to modify
Tokenizers to do this but now I think maybe this Stage could do it
for any Tokenizer ...
> Make graph-based TokenFilters easier
> ------------------------------------
>
> Key: LUCENE-5012
> URL: https://issues.apache.org/jira/browse/LUCENE-5012
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/analysis
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Attachments: LUCENE-5012.patch
>
>
> SynonymFilter has two limitations today:
> * It cannot create positions, so eg dns -> domain name service
> creates blatantly wrong highlights (SOLR-3390, LUCENE-4499 and
> others).
> * It cannot consume a graph, so e.g. if you try to apply synonyms
> after Kuromoji tokenizer I'm not sure what will happen.
> I've thought about how to fix these issues but it's really quite
> difficult with the current PosInc/PosLen graph representation, so I'd
> like to explore an alternative approach.
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