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https://issues.apache.org/jira/browse/LUCENE-2901?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12988626#action_12988626
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Simon Willnauer commented on LUCENE-2901:
-----------------------------------------

{quote}
if (keywordSet.contains(word))
  keywordAtt.setKeyword(true);
{quote}
I just looked at the code and that change makes sense actually - it should 
really be consistent to StopFitler etc.

simon

> KeywordMarkerFilter resets keyword attribute state to false for tokens not in 
> protwords.txt
> -------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-2901
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2901
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Analysis
>    Affects Versions: 3.1
>            Reporter: Drew Farris
>            Assignee: Robert Muir
>            Priority: Minor
>             Fix For: 3.1, 4.0
>
>         Attachments: LUCENE-2901.patch
>
>
> KeywordMarkerFilter sets true or false for the KeywordAttribute on all 
> tokens. This erases previous state established further up the filter chain, 
> for example in the case where a custom filter wants to prevent a token from 
> being stemmed. 
> If a token is already marked as a keyword (KeywordAttribute.isKeyword() == 
> true), perhaps the KeywordMarkerFilterFactory should not re-set the state to 
> false.

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