benchmark pkg: allow TrecContentSource not to change the docname
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                 Key: LUCENE-2059
                 URL: https://issues.apache.org/jira/browse/LUCENE-2059
             Project: Lucene - Java
          Issue Type: Improvement
            Reporter: Robert Muir
            Assignee: Robert Muir
            Priority: Minor
             Fix For: 3.0
         Attachments: LUCENE-2059.patch

TrecContentSource currently appends 'iteration number' to the docname field.
Example: if the original docname is DOC0001 then it will be indexed as DOC0001_0

this presents a problem for relevance testing, because when judging results, 
the expected docname will never be present.
This patch adds an option to disable this behavior, defaulting to the existing 
behavior (which is to append the iteration number).


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