ElasticSearch 7.x 指定索引类型出现下面错误

# PUT请求： http://IP地址：端口/t1

{
    "settings": {
        "index": {
            "number_of_shards": "2",
            "number_of_replicas": "0"
        }
    },
    "mappings": {
        "person": {
            "properties": {
                "name": {
                    "type": "text"
                },
                "age": {
                    "type": "integer"
                },
                "mail": {
                    "type": "keyword"
                },
                "hobby": {
                    "type": "text"
                }
            }
        }
    }
}

{
    "error": {
        "root_cause": [
            {
                "type": "mapper_parsing_exception",
                "reason": "Root mapping definition has unsupported parameters:  [person : {properties={mail={type=keyword}, name={type=text}, age={type=integer}, hobby={type=text}}}]"
            }
        ],
        "type": "mapper_parsing_exception",
        "reason": "Failed to parse mapping [_doc]: Root mapping definition has unsupported parameters:  [person : {properties={mail={type=keyword}, name={type=text}, age={type=integer}, hobby={type=text}}}]",
        "caused_by": {
            "type": "mapper_parsing_exception",
            "reason": "Root mapping definition has unsupported parameters:  [person : {properties={mail={type=keyword}, name={type=text}, age={type=integer}, hobby={type=text}}}]"
        }
    },
    "status": 400
}