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Posted to dev@lucene.apache.org by "Shawn Heisey (JIRA)" <ji...@apache.org> on 2017/09/06 18:26:00 UTC

[jira] [Created] (LUCENE-7960) NGram filters -- add option to keep short terms

Shawn Heisey created LUCENE-7960:
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             Summary: NGram filters -- add option to keep short terms
                 Key: LUCENE-7960
                 URL: https://issues.apache.org/jira/browse/LUCENE-7960
             Project: Lucene - Core
          Issue Type: Improvement
          Components: modules/analysis
            Reporter: Shawn Heisey


When ngram or edgengram filters are used, any terms that are shorter than the minGramSize are completely removed from the token stream.

This is probably 100% what was intended, but I've seen it cause a lot of problems for users.  I am not suggesting that the default behavior be changed.  That would be far too disruptive to the existing user base.

I do think there should be a new boolean option, with a name like keepShortTerms, that defaults to false, to allow the short terms to be preserved.




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