58 lines
1.4 KiB
Plaintext
58 lines
1.4 KiB
Plaintext
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[[analysis-normalizers]]
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== Normalizers
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experimental[]
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Normalizers are similar to analyzers except that they may only emit a single
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token. As a consequence, they do not have a tokenizer and only accept a subset
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of the available char filters and token filters. Only the filters that work on
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a per-character basis are allowed. For instance a lowercasing filter would be
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allowed, but not a stemming filter, which needs to look at the keyword as a
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whole.
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[float]
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=== Custom analyzers
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Elasticsearch does not ship with built-in normalizers so far, so the only way
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to get one is by building a custom one. Custom normalizers take a list of char
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<<analysis-charfilters, character filters>> and a list of
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<<analysis-tokenfilters,token filters>>.
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[source,js]
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--------------------------------
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PUT index
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{
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"settings": {
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"analysis": {
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"char_filter": {
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"quote": {
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"type": "mapping",
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"mappings": [
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"« => \"",
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"» => \""
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]
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}
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},
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"normalizer": {
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"my_normalizer": {
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"type": "custom",
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"char_filter": ["quote"],
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"filter": ["lowercase", "asciifolding"]
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}
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}
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}
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},
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"mappings": {
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"type": {
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"properties": {
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"foo": {
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"type": "keyword",
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"normalizer": "my_normalizer"
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}
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}
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}
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}
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}
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--------------------------------
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// CONSOLE
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