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https://issues.apache.org/jira/browse/LUCENE-3475?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13116782#comment-13116782
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Steven Rowe commented on LUCENE-3475:
-------------------------------------
>From [the ShingleFilter
>javadocs|http://lucene.apache.org/java/3_4_0/api/all/org/apache/lucene/analysis/shingle/ShingleFilter.html]:
> "This filter handles position increments > 1 by inserting filler tokens
>(tokens with termtext "_"). It does not handle a position increment of 0."
> ShingleFilter Creates Shingles for Single Term
> ----------------------------------------------
>
> Key: LUCENE-3475
> URL: https://issues.apache.org/jira/browse/LUCENE-3475
> Project: Lucene - Java
> Issue Type: Bug
> Components: modules/analysis
> Affects Versions: 3.4
> Reporter: Cameron
> Priority: Minor
>
> 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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