Robert Muir created LUCENE-6317:
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             Summary: Fix readStringStringMap api
                 Key: LUCENE-6317
                 URL: https://issues.apache.org/jira/browse/LUCENE-6317
             Project: Lucene - Core
          Issue Type: Sub-task
            Reporter: Robert Muir


Currently this api is not very efficient, and always returns a mutable map.

Can we change it to allow immutability? its sad we don't return 
Collections.emptyMap so its the same instance for all empty cases.



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