106 lines
3.0 KiB
Plaintext
106 lines
3.0 KiB
Plaintext
[[analysis-phonetic]]
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=== Phonetic Analysis Plugin
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The Phonetic Analysis plugin provides token filters which convert tokens to
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their phonetic representation using Soundex, Metaphone, and a variety of other
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algorithms.
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:plugin_name: analysis-phonetic
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include::install_remove.asciidoc[]
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[[analysis-phonetic-token-filter]]
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==== `phonetic` token filter
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The `phonetic` token filter takes the following settings:
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`encoder`::
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Which phonetic encoder to use. Accepts `metaphone` (default),
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`double_metaphone`, `soundex`, `refined_soundex`, `caverphone1`,
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`caverphone2`, `cologne`, `nysiis`, `koelnerphonetik`, `haasephonetik`,
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`beider_morse`, `daitch_mokotoff`.
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`replace`::
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Whether or not the original token should be replaced by the phonetic
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token. Accepts `true` (default) and `false`. Not supported by
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`beider_morse` encoding.
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[source,console]
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--------------------------------------------------
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PUT phonetic_sample
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{
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"settings": {
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"index": {
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"analysis": {
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"analyzer": {
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"my_analyzer": {
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"tokenizer": "standard",
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"filter": [
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"lowercase",
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"my_metaphone"
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]
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}
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},
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"filter": {
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"my_metaphone": {
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"type": "phonetic",
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"encoder": "metaphone",
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"replace": false
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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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GET phonetic_sample/_analyze
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{
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"analyzer": "my_analyzer",
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"text": "Joe Bloggs" <1>
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}
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--------------------------------------------------
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<1> Returns: `J`, `joe`, `BLKS`, `bloggs`
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It is important to note that `"replace": false` can lead to unexpected behavior since
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the original and the phonetically analyzed version are both kept at the same token position.
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Some queries handle these stacked tokens in special ways. For example, the fuzzy `match`
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query does not apply {ref}/common-options.html#fuzziness[fuzziness] to stacked synonym tokens.
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This can lead to issues that are difficult to diagnose and reason about. For this reason, it
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is often beneficial to use separate fields for analysis with and without phonetic filtering.
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That way searches can be run against both fields with differing boosts and trade-offs (e.g.
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only run a fuzzy `match` query on the original text field, but not on the phonetic version).
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[float]
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===== Double metaphone settings
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If the `double_metaphone` encoder is used, then this additional setting is
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supported:
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`max_code_len`::
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The maximum length of the emitted metaphone token. Defaults to `4`.
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[float]
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===== Beider Morse settings
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If the `beider_morse` encoder is used, then these additional settings are
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supported:
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`rule_type`::
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Whether matching should be `exact` or `approx` (default).
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`name_type`::
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Whether names are `ashkenazi`, `sephardic`, or `generic` (default).
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`languageset`::
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An array of languages to check. If not specified, then the language will
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be guessed. Accepts: `any`, `common`, `cyrillic`, `english`, `french`,
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`german`, `hebrew`, `hungarian`, `polish`, `romanian`, `russian`,
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`spanish`.
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