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Add preserve original token option to ASCIIFolding #5115

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Add preserve original token option to ASCIIFolding #5115

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41 changes: 40 additions & 1 deletion docs/reference/analysis/tokenfilters/asciifolding-tokenfilter.asciidoc
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Expand Up @@ -4,4 +4,43 @@
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.
equivalents, if one exists. Example:

[source,js]
--------------------------------------------------
"index" : {
"analysis" : {
"analyzer" : {
"default" : {
"tokenizer" : "standard",
"filter" : ["standard", "asciifolding"]
}
}
}
}
--------------------------------------------------

coming[1.1.0]
Accepts `preserve_original` setting which defaults to false but if true
will keep the oringal 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
}
}
}
}
--------------------------------------------------