A filter that stems words using a Snowball-generated stemmer. The language parameter controls the stemmer with the following available values: Arabic, Armenian, Basque, Catalan, Danish, Dutch, English, Estonian, Finnish, French, German, German2, Hungarian, Italian, Irish, Kp, Lithuanian, Lovins, Norwegian, Porter, Portuguese, Romanian, Russian, Spanish, Swedish, Turkish.

For example:

PUT /my-index-000001
{
  "settings": {
    "analysis": {
      "analyzer": {
        "my_analyzer": {
          "tokenizer": "standard",
          "filter": [ "lowercase", "my_snow" ]
        }
      },
      "filter": {
        "my_snow": {
          "type": "snowball",
          "language": "Lovins"
        }
      }
    }
  }
}