ES4-1节创建索引的时候，报以下错误？

Question

{    "error": {        "root_cause": [            {                "type": "illegal_argument_exception",                "reason": "Rejecting mapping update to [people] as the final mapping would have more than 1 type: [woman, man]"            }        ],        "type": "illegal_argument_exception",        "reason": "Rejecting mapping update to [people] as the final mapping would have more than 1 type: [woman, man]"    },    "status": 400}