But in this case the fuzzy is performed on the overall index? The QueryFilter do his 
job after ?
I'm not sure to understand the QueryFilter meaning?

But I test the QueryFilter also this way and the time to doing this search it's the 
same.

The fuzzy is time consuming, this is normal, so I'm searching a solution to having 
less term to compare with fuzzy algorithm. 

I'm checking the FuzzyTermEnum class and searching how to redifine this to implement a 
FuzzySubsetTermEnum with constructor : 
FuzzySubsetTermEnum(IndexReader reader, Term term, Term subset)

For retrieving only the term which also 

Erik Hatcher wrote :

>>
>>QueryFilter would do the trick if you instead used the
>>query you handed 
>>to it to be the one to single out a "sub-category".  It
>>would limit the 
>>documents searched to just the sub-category, and the
>>fuzzy search would 
>>be done using IndexSearcher.search, only handing it the
>>filter then as 
>>well.
>>
>>Will this scheme work for you?
>>
>>      Erik
>>
>>
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