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https://issues.apache.org/jira/browse/LUCENE-4810?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13637785#comment-13637785
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Steve Rowe commented on LUCENE-4810:
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I see FilteringTokenFilter has a similar first token pos incr fixup, so this
problem is handled in at least one other filter. I'll take a broader look
tomorrow.
> Positions are incremented for each ngram in EdgeNGramTokenFilter
> ----------------------------------------------------------------
>
> Key: LUCENE-4810
> URL: https://issues.apache.org/jira/browse/LUCENE-4810
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/analysis
> Reporter: Walter Underwood
> Assignee: Michael McCandless
> Fix For: 5.0, 4.3
>
> Attachments: LUCENE-4810.diff,
> LUCENE-4810-first-token-position-increment.patch, LUCENE-4810.patch,
> LUCENE-4810.patch
>
>
> Edge ngrams should be like synonyms, with all the ngrams generated from a
> token having the same position as that original token. The current code
> increments position.
> For the text "molecular biology", the query "mol bio" should match as a
> phrase in neighboring positions. It does not.
> You can see this in the Analysis page in the admin UI.
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