scala - 使用elastic4s创建索引设置

我有一些课：

class SomeClass(val client: ElasticClient, val config: Config, val configName: String)(implicit val ec: ExecutionContext) extends ElasticSearchRepositoryWrapper[AnotherClass]{ override def mapping: Option[MappingDefinition] = Some( properties( KeywordField("id"), TextField("name").fielddata(true).analyzer("ngram_analyzer"), KeywordField("lang"), BasicField("order", "long"), ... ) ) 

我正在repository.createIndexIfNotExists()使用此映射创建索引。
现在，我必须ngram_analyzer在索引设置中创建：

  "settings": { "index": { "analysis": { "analyzer": { "ngram_analyzer": { "filter": [ "lowercase" ], "tokenizer": "my_tokenizer" } }, "tokenizer": { "my_tokenizer": { "token_chars": [ "letter", "digit" ], "min_gram": "3", "type": "ngram", "max_gram": "3" } } } } 

如何使用elastic4s做到这一点？