elasticsearch不能删除已有index中的字段吧？

## 修改字段值

POST test/_doc/1/_update

{

    "script" : {

        "source": "ctx._source.counter += params.count",

        "lang": "painless",

        "params" : {

            "count" : 4

        }

    }

}



## 删除值的某个元素

POST test/_doc/1/_update

{

    "script" : {

        "source": "if (ctx._source.tags.contains(params.tag)) { ctx._source.tags.remove(ctx._source.tags.indexOf(params.tag)) }",

        "lang": "painless",

        "params" : {

            "tag" : "blue"

        }

    }

}



## 添加字段

POST test/_doc/1/_update

{

    "script" : "ctx._source.new_field = 'value_of_new_field'"

}



## 删除字段

POST test/_doc/1/_update

{

    "script" : "ctx._source.remove('new_field')"

}