Simon Willnauer created LUCENE-4817:
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Summary: Add KeywordRepeaterFilter to emit tokens twice once as
keyword and once not as keyword
Key: LUCENE-4817
URL: https://issues.apache.org/jira/browse/LUCENE-4817
Project: Lucene - Core
Issue Type: Improvement
Components: modules/analysis
Affects Versions: 4.1
Reporter: Simon Willnauer
Priority: Minor
Fix For: 5.0, 4.3
if you want to have a stemmed and an unstemmed version of a token one for
recall and one for precision you have to do two fields today in most of the
cases. Yet, most of the stemmers respect the keyword attribute so we could add
a token filter that emits the same token twice once as keyword and once plain.
Folks would most likely need to combine this RemoveDuplicatesTokenFilter but
that way we can have stemmed and unstemmed version in the same field.
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