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https://issues.apache.org/jira/browse/LUCENE-3475?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16358207#comment-16358207
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Alan Woodward commented on LUCENE-3475:
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{quote}but won't generate a graph unless the input is a graph too
{quote}
Correct
{quote}Should we just replace it?
{quote}
I'll need to rejig it slightly so that it produces identical output, but I
think that's worth doing. And a drop-in replacement would be easier for
upgrades as well.
I'll add some more tests, mixing up CannedTokenStream and real analyzer outputs.
> ShingleFilter should handle positionIncrement of zero, e.g. synonyms
> --------------------------------------------------------------------
>
> Key: LUCENE-3475
> URL: https://issues.apache.org/jira/browse/LUCENE-3475
> Project: Lucene - Core
> Issue Type: New Feature
> Components: modules/analysis
> Reporter: Cameron
> Assignee: Alan Woodward
> Priority: Minor
> Labels: newdev
> Attachments: LUCENE-3475.patch
>
>
> ShingleFilter is creating shingles for a single term that has been expanded
> by synonyms when it shouldn't. The position increment is 0.
> As an example, I have an Analyzer with a SynonymFilter followed by a
> ShingleFilter. Assuming car and auto are synonyms, the SynonymFilter produces
> two tokens and position 1: car, auto. The ShingleFilter is then producing 3
> tokens, when there should only be two: car, car auto, auto. This behavior
> seems incorrect.
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