elasticsearch修改索引映射報mapping type is missing

elasticsearch版本6.8.4，我有一個索引megacorp，類型employee，查看索引映射如下

GET /megacrop/_mapping

{
  "megacrop": {
    "mappings": {
      "megacrop": {
        "properties": {
          "about": {
            "type": "keyword"
          },
          "age": {
            "type": "integer"
          },
          "firstName": {
            "type": "keyword"
          },
          "id": {
            "type": "keyword"
          },
          "interests": {
            "type": "keyword"
          },
          "lastName": {
            "type": "keyword"
          }
        }
      }
    }
  }
}

現在我想把其中的interests列改爲支持聚合查詢，需要增加"fielddata": true屬性

執行命令 PUT /megacorp/_mapping

{
    "employee": {
    "properties": {
      "about": {
        "type": "text",
        "fields": {
          "keyword": {
            "type": "keyword",
            "ignore_above": 256
          }
        }
      },
      "age": {
        "type": "long"
      },
      "first_name": {
        "type": "text",
        "fields": {
          "keyword": {
            "type": "keyword",
            "ignore_above": 256
          }
        }
      },
      "interests": {
        "type": "text",
        "fielddata": true,
        "fields": {
          "keyword": {
            "type": "keyword",
            "ignore_above": 256
          }
        }
      },
      "last_name": {
        "type": "text",
        "fields": {
          "keyword": {
            "type": "keyword",
            "ignore_above": 256
          }
        }
      }
    }
  }
}
  

報錯

{
  "error": {
    "root_cause": [
      {
        "type": "action_request_validation_exception",
        "reason": "Validation Failed: 1: mapping type is missing;"
      }
    ],
    "type": "action_request_validation_exception",
    "reason": "Validation Failed: 1: mapping type is missing;"
  },
  "status": 400
}

檢查發現是地址寫錯了，應該是PUT /megacorp/employee/_mapping

修改後執行成功