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https://issues.apache.org/jira/browse/LUCENE-4817?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Simon Willnauer updated LUCENE-4817:
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Attachment: LUCENE-4817.patch
adding patch again, this time the right one.
> 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
>
> Attachments: LUCENE-4817.patch, LUCENE-4817.patch
>
>
> 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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