6.1.2如何用java创建下图Mapping映射（重点是board_train_code字段）

PUT /abc
{
  "settings": {
    "number_of_shards": "10",
    "number_of_replicas": "1"
  },
    "mappings": {
      "doc": {
        "dynamic": "strict",
        "properties": {
          "address": {
            "type": "text",
            "analyzer": "ik_max_word"
          },
          "board_train_code": {
            "type": "text",
            "fields": {
              "keyword": {
                "type": "keyword",
                "ignore_above": 256
              }
            }
          },
          "borad_train_code": {
            "type": "text",
            "analyzer": "ik_max_word"
          }
        }
      }
    }
}