FastVectorHighlighter FieldTermStack could likely benefit from using 
TermVectorMapper
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                 Key: LUCENE-2949
                 URL: https://issues.apache.org/jira/browse/LUCENE-2949
             Project: Lucene - Java
          Issue Type: Improvement
    Affects Versions: 3.0.3, 4.0
            Reporter: Grant Ingersoll
            Priority: Minor
             Fix For: 3.2, 4.0


Based on my reading of the FieldTermStack constructor that loads the vector 
from disk, we could probably save a bunch of time and memory by using the 
TermVectorMapper callback mechanism instead of materializing the full array of 
terms into memory and then throwing most of them out.

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