如何在scala中将Rank特征类型字段添加到索引中？

import com.sksamuel.elastic4s.{ElasticClient, ElasticsearchClientUri}
import com.sksamuel.elastic4s.http.JavaClient

// 创建Elasticsearch客户端连接
val clientUri = ElasticsearchClientUri("http://localhost:9200")
val client = ElasticClient(JavaClient(clientUri))

// 定义索引名称和类型
val indexName = "my_index"
val indexType = "my_type"

// 定义要添加的字段名称和类型
val fieldName = "rank"
val fieldType = "integer"

// 创建索引并定义字段映射
client.execute {
  createIndex(indexName).mappings(
    mapping(indexType).fields(
      field(fieldName, fieldType)
    )
  )
}.await

// 提交索引的更改
client.execute {
  refreshIndex(indexName)
}.await