magibney commented on pull request #15:
URL: https://github.com/apache/lucene/pull/15#issuecomment-800749558


   Right; the normalization optimizations are not conceived of as a 
general-purpose type thing. I think [this 
comment](https://github.com/apache/lucene-solr/pull/892#issuecomment-563293051) 
might be applicable? particularly:
   
   > The assumeExternalUnicodeNormalization arg cannot simply be flipped in 
isolation without affecting behavior. My conception of this arg is as an 
"expert" option that can significantly improve performance, but requires users 
to know (and externally compensate for, with specific ICUNormalizer2CharFilters 
in the top-level analysis chain) the specific type of input and output unicode 
normalization applied by a particular transliterator.


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