Improved large result handling
------------------------------

                 Key: LUCENE-2127
                 URL: https://issues.apache.org/jira/browse/LUCENE-2127
             Project: Lucene - Java
          Issue Type: New Feature
            Reporter: Grant Ingersoll
            Priority: Minor


Per 
http://search.lucidimagination.com/search/document/350c54fc90d257ed/lots_of_results#fbb84bd297d15dd5,
 it would be nice to offer some other Collectors that are better at handling 
really large number of results.  This could be implemented in a variety of ways 
via Collectors.  For instance, we could have a raw collector that does no 
sorting and just returns the ScoreDocs, or we could do as Mike suggests and 
have Collectors that have heuristics about memory tradeoffs and only heapify 
when appropriate.

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