[[analysis-asciifolding-tokenfilter]] === ASCII Folding Token Filter A token filter of type `asciifolding` that converts alphabetic, numeric, and symbolic Unicode characters which are not in the first 127 ASCII characters (the "Basic Latin" Unicode block) into their ASCII equivalents, if one exists. Example: [source,js] -------------------------------------------------- "index" : { "analysis" : { "analyzer" : { "default" : { "tokenizer" : "standard", "filter" : ["standard", "asciifolding"] } } } } -------------------------------------------------- Accepts `preserve_original` setting which defaults to false but if true will keep the original token as well as emit the folded token. For example: [source,js] -------------------------------------------------- "index" : { "analysis" : { "analyzer" : { "default" : { "tokenizer" : "standard", "filter" : ["standard", "my_ascii_folding"] } }, "filter" : { "my_ascii_folding" : { "type" : "asciifolding", "preserve_original" : true } } } } --------------------------------------------------