RemoveDuplicatesTokenFilter doest have expected behaviour
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                 Key: SOLR-1869
                 URL: https://issues.apache.org/jira/browse/SOLR-1869
             Project: Solr
          Issue Type: Bug
          Components: Schema and Analysis
            Reporter: Joe Calderon
            Priority: Minor
         Attachments: SOLR-1869.patch

the RemoveDuplicatesTokenFilter seems broken as it initializes its map and 
attributes at the class level and not within its constructor
in addition i would think the expected behaviour would be to remove identical 
terms with the same offset positions, instead it looks like it removes 
duplicates based on position increment which wont work when using it after 
something like the edgengram filter. when i posted this to the mailing list 
even erik hatcher seemed to think thats what this filter was supposed to do...

attaching a patch that has the expected behaviour and initializes variables in 
constructor

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