Track total term freq per term
------------------------------

                 Key: LUCENE-2862
                 URL: https://issues.apache.org/jira/browse/LUCENE-2862
             Project: Lucene - Java
          Issue Type: Improvement
          Components: Index
            Reporter: Michael McCandless
            Assignee: Michael McCandless
             Fix For: 4.0


Right now we track docFreq for each term (how many docs have the
term), but the totalTermFreq (total number of occurrences of this
term, ie sum of freq() for each doc that has the term) is also a
useful stat (for flex scoring, PulsingCodec, etc.).


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