往已存在的index增加字段报错，求助

{ - 

  "error": { - 

    "root_cause": [ - 

      { - 

        "type": "illegal_argument_exception",

        "reason": "Can't merge because of conflicts: [Cannot update excludes setting for [_source]]"

      }

    ],

    "type": "illegal_argument_exception",

    "reason": "Can't merge because of conflicts: [Cannot update excludes setting for [_source]]"

  },

  "status": 400

}

PUT my-index/_mapping

{

  "properties": {

    "content2": {

      "analyzer": "ik_max_word",

      "type": "text"

    }

  }

}

{ - 

  "my-index": { - 

    "aliases": { - 



    },

    "mappings": { - 

      "_all": { - 

        "enabled": false

      },

      "_source": { - 

        "excludes": [ - 

          "content"

        ]

      },

      "dynamic_templates": [ - 

        { - 

          "str": { - 

            "match_mapping_type": "string",

            "mapping": { - 

              "index": false,

              "store": false,

              "type": "keyword"

            }

          }

        }

      ],

      "properties": { - 

        "@timestamp": { - 

          "type": "date"

        },

        "content": { - 

          "type": "text",

          "analyzer": "ik_max_word"

        }

        "sid": { - 

          "type": "keyword"

        }

      }

    },

    "settings": { - 

      "index": { - 

        "number_of_shards": "6",

        "provided_name": "my-index",

        "mapper": { - 

          "dynamic": "true"

        },

        "creation_date": "1572581052119",

        "store": { - 

          "type": "niofs"

        },

        "number_of_replicas": "1",

        "uuid": "aHHcjI_NQlyOUVcnkm1ZUg",

        "version": { - 

          "created": "6040399",

          "upgraded": "7070199"

        }

      }

    }

  }

}