elasticsearch提示Parse Failure [No mapping found for [filed] in order to sort on]]的解决办法

排序代码如下:

{
    "sort": [
        {
            "porn_score": {
                "order": "desc"
            }
        }
    ]
}

直接报错Parse Failure [No mapping found for [filed] in order to sort on]]

修改后的代码如下:

{
    "sort": [
        {
            "porn_score": {
                "order": "desc", 
                "ignore_unmapped": true
            }
        }
    ]
}