disable positions for spellchecker ngram fields
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                 Key: LUCENE-3306
                 URL: https://issues.apache.org/jira/browse/LUCENE-3306
             Project: Lucene - Java
          Issue Type: Improvement
            Reporter: Robert Muir
             Fix For: 3.4, 4.0


In LUCENE-2391 we optimized spellchecker (re)build time/ram usage by omitting 
frequencies/positions/norms for single-valued fields,
among other things.

Now that we can disable positions but keep freqs, we should disable them for 
the n-gram fields, because the spellchecker does
not use positional queries.


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