[jira] Created: (SOLR-1707) Use google collections immutable collections instead of Collections.unmodifiable**

[Noble Paul (JIRA)]

Use google collections immutable collections instead of 
Collections.unmodifiable**
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                 Key: SOLR-1707
                 URL: https://issues.apache.org/jira/browse/SOLR-1707
             Project: Solr
          Issue Type: Improvement
            Reporter: Noble Paul
            Assignee: Noble Paul
             Fix For: 1.5


google collections offer true immutability is more memory efficiency

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