no handler for type [icu_collation_keyword] declared on field

I'm trying to create index with the mapping.

Using URL : localhost:9200/test3?pretty Method : PUT and with body

{  
"mappings": {
"properties": {
  "name": {
    "type": "text",
    "fields": {
      "keyword": {
        "type": "keyword",
        "ignore_above": 256
      },
      "sort_da": {
        "type": "icu_collation_keyword",
        "index": false,
        "language": "da",
        "country": "DK",
        "variant": "@collation=phonebook"
      },
      "sort_de": {
        "type": "icu_collation_keyword",
        "index": false,
        "language": "de",
        "country": "DE",
        "variant": "@collation=phonebook"
      }
    }
  }
}

} }

I'm getting following exception

"type": "mapper_parsing_exception",
"reason": "no handler for type [icu_collation_keyword] declared on field [sort_de]"