本地英文版地址: ../en/analysis-stemmer-tokenfilter.html
Stemmer token filteredit
Provides algorithmic stemming for several languages,
some with additional variants. For a list of supported languages, see the
language parameter.
When not customized, the filter uses the porter stemming algorithm for English.
Exampleedit
The following analyze API request uses the stemmer filter’s default porter
stemming algorithm to stem the foxes jumping quickly to the fox jump
quickli:
GET /_analyze
{
"tokenizer": "standard",
"filter": [ "stemmer" ],
"text": "the foxes jumping quickly"
}
The filter produces the following tokens:
[ the, fox, jump, quickli ]
Add to an analyzeredit
The following create index API request uses the
stemmer filter to configure a new custom
analyzer.
PUT /my_index
{
"settings": {
"analysis": {
"analyzer": {
"my_analyzer": {
"tokenizer": "whitespace",
"filter": [ "stemmer" ]
}
}
}
}
}
Configurable parametersedit
-
language -
(Optional, string) Language-dependent stemming algorithm used to stem tokens. If both this and the
nameparameter are specified, thelanguageparameter argument is used.Valid values for
languageValid values are sorted by language. Defaults to
english. Recommended algorithms are bolded.- Arabic
-
arabic - Armenian
-
armenian - Basque
-
basque - Bengali
-
bengali - Brazilian Portuguese
-
brazilian - Bulgarian
-
bulgarian - Catalan
-
catalan - Czech
-
czech - Danish
-
danish - Dutch
-
dutch,dutch_kp - English
-
english,light_english,lovins,minimal_english,porter2,possessive_english - Estonian
-
estonian - Finnish
-
finnish,light_finnish - French
-
light_french,french,minimal_french - Galician
-
galician,minimal_galician(Plural step only) - German
-
light_german,german,german2,minimal_german - Greek
-
greek - Hindi
-
hindi - Hungarian
-
hungarian,light_hungarian - Indonesian
-
indonesian - Irish
-
irish - Italian
-
light_italian,italian - Kurdish (Sorani)
-
sorani - Latvian
-
latvian - Lithuanian
-
lithuanian - Norwegian (Bokmål)
-
norwegian,light_norwegian,minimal_norwegian - Norwegian (Nynorsk)
-
light_nynorsk,minimal_nynorsk - Portuguese
-
light_portuguese,minimal_portuguese,portuguese,portuguese_rslp - Romanian
-
romanian - Russian
-
russian,light_russian - Spanish
-
light_spanish,spanish - Swedish
-
swedish,light_swedish - Turkish
-
turkish
-
name -
An alias for the
languageparameter. If both this and thelanguageparameter are specified, thelanguageparameter argument is used.
Customizeedit
To customize the stemmer filter, duplicate it to create the basis for a new
custom token filter. You can modify the filter using its configurable
parameters.
For example, the following request creates a custom stemmer filter that stems
words using the light_german algorithm:
PUT /my_index
{
"settings": {
"analysis": {
"analyzer": {
"my_analyzer": {
"tokenizer": "standard",
"filter": [
"lowercase",
"my_stemmer"
]
}
},
"filter": {
"my_stemmer": {
"type": "stemmer",
"language": "light_german"
}
}
}
}
}