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https://issues.apache.org/jira/browse/LUCENE-5227?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13772353#comment-13772353
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Hoss Man commented on LUCENE-5227:
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bq. We could convert our files for 5.0, and just update our stuff 
appropriately, and of course still support parsing the old format, and it 
wouldnt break anyway, just reduce traps i think

If we're going to still support the snowball format, we could also make the 
"format" param mandatory in StopFilterFactory in 5.0 (and log a warning if not 
specified in 4.6+ to give people heads up when upgrading through the minor 
versions)
                
> consider unifying stopwords formats for 5.0
> -------------------------------------------
>
>                 Key: LUCENE-5227
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5227
>             Project: Lucene - Core
>          Issue Type: Task
>    Affects Versions: 5.0
>            Reporter: Robert Muir
>
> Hossman has background on LUCENE-5211.
> The story is we added these to lucene (it used to be a 'svn export' from 
> snowball tree!!!!) and i had several reasons for supporting the snowball 
> format:
> 1. svn export/easier to maintain diffs
> 2. in lucene from Analyzer APIs, as a default "Set" it didnt much matter.
> 3. the snowball format is nice the way they present e.g. inflection tables 
> for some languages that inflect pronouns.
> But the reality is:
> 1. people try to use these from e.g. solr and hit traps.
> 2. these things are not changing hardly at all in the snowball repository.
> 3. we don't do svn export anymore.
> 4. the "tables" could just be preserved inside # comments and still explain 
> why the words are in the file.
> We could convert our files for 5.0, and just update our stuff appropriately, 
> and of course still support parsing the old format, and it wouldnt break 
> anyway, just reduce traps i think.

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