FuzzyQuery using termDocs() for context filtering

Hi!

Imagine an index holding documents in different languages
and country. 
Language+country is what I call a context and I build and
hold a QueryFilter 
for each context.

When performing a fuzzy search, FilteredTermEnum doesn't
care about any 
contexts at all (well, how should it . It builds
a BooleanQuery of all 
terms that come into question.

I came up with the idea to reimplementing FuzzyTermEnum to
use 
reader.termDocs() instead of reader.terms(). This way for
each term I know 
which document it comes from and by means of the above
mentioned QueryFilter 
I can decide whether the term is valid for the given context
or not.

This results (potentially) in a smaller BooleanQuery but I
wonder whether this 
approach will gain any mentionable performance advantage
(maybe reduce IO?).

Timo

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