elasticsearch. guide

A filter that stems words (similar to snowball, but with more options). The language/name parameter controls the stemmer with the following available values:

armenian, basque, catalan, danish, dutch, english, finnish, french, german, german2, hungarian, italian, kp, lovins, norwegian, porter, porter2, portuguese, romanian, russian, spanish, swedish, turkish, minimal_english, possessive_english, light_finish, light_french, minimal_french, light_german, minimal_german, hindi, light_hungarian, indonesian, light_italian, light_portuguese, minimal_portuguese, portuguese, light_russian, light_spanish, light_swedish.

For example:

{
    "index" : {
        "analysis" : {
            "analyzer" : {
                "my_analyzer" : {
                    "tokenizer" : "standard",
                    "filter" : ["standard", "lowercase", "my_stemmer"]
                }
            },
            "filter" : {
                "my_stemmer" : {
                    "type" : "stemmer",
                    "name" : "light_german"
                }
            }
        }
    }
}