Stemmer Token Filter（Stemmer 词元过滤器）

原文链接 : https://www.elastic.co/guide/en/elasticsearch/reference/current/analysis-stemmer-tokenfilter.html

译文链接 : http://www.apache.wiki/pages/viewpage.action?pageId=10028526

贡献者 : fucker，ApacheCN，Apache中文网

 一个过滤器，通过单个统一接口提供（几乎）所有可用的词干词元过滤器的访问，例如：

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

language / name 参数用以下可用值控制词干（首选过滤器以粗体标记）：

| Arabic | arabic | | Armenian | armenian | | Basque | basque | | Brazilian Portuguese | brazilian | | Bulgarian | bulgarian | | Catalan | catalan | | Czech | czech | | Danish | danish | | Dutch | dutch, dutch_kp | | English | english, light_english, minimal_english, possessive_english, porter2,lovins | | Finnish | finnish, light_finnish | | French | french, light_french, minimal_french | | Galician | galician, minimal_galician (Plural step only) | | German | german, german2, light_german, minimal_german | | Greek | greek | | Hindi | hindi | | Hungarian | hungarian, light_hungarian | | Indonesian | indonesian | | Irish | irish | | Italian | italian, light_italian | | Kurdish (Sorani) | sorani | | Latvian | latvian | | Lithuanian | lithuanian | | Norwegian (Bokmål) | norwegian, light_norwegian, minimal_norwegian | | Norwegian (Nynorsk) | light_nynorsk, minimal_nynorsk | | Portuguese | portuguese, light_portuguese, minimal_portuguese, portuguese_rslp | | Romanian | romanian | | Russian | russian, light_russian | | Spanish | spanish, light_spanish | | Swedish | swedish, light_swedish | | Turkish | turkish |