Asciifolding filter emit original token

[nik9000]

I'm looking to make asciifolding optional in my (English) index. If the user searches without any high ascii characters then I want to match against the folded tokens. If the user searches with high ascii characters then I only want to match the unfolded tokens.

I think the right way to implement this would be to get the asciifolding filter to spit out both the folded and unfolded tokens during indexing with 0 position increment between them and to not use it at all during searching. Is that possible right now? If not would Elasticsearch like me to make one? If so, does it make sense to add a subclass of the asciifoling filter that supports the keyword parameter as though it were a stemmer?

[nik9000]

Sorry for filing a question as an issue. I didn't quite think this through. If a code change is required I'll reopen.

[nik9000]

It looks like there is no way to do this now so I filed an issue with Lucene and sent a patch. I'll port it over to Elasticsearch and get it registered in the analysis infrastructure once it gets merged into Lucene.