Mapper for [date] conflicts with existing mapper:\n\tCannot update parameter [format] from [yyyyMMdd HH:mm:ss||yyyyMMdd||epoch_millis] to [strict_date_optional_time||epoch_millis]

PUT http://127.0.0.1:9200/people/man/1
{
    "name": "wali",
    "country": "china",
    "age": 29,
    "date": "1988-03-10"
}

报错

{
    "error": {
        "root_cause": [
            {
                "type": "illegal_argument_exception",
                "reason": "Mapper for [date] conflicts with existing mapper:\n\tCannot update parameter [format] from [yyyyMMdd HH:mm:ss||yyyyMMdd||epoch_millis] to [strict_date_optional_time||epoch_millis]"
            }
        ],
        "type": "illegal_argument_exception",
        "reason": "Mapper for [date] conflicts with existing mapper:\n\tCannot update parameter [format] from [yyyyMMdd HH:mm:ss||yyyyMMdd||epoch_millis] to [strict_date_optional_time||epoch_millis]"
    },
    "status": 400
}