ES如何更新数组中某一个字段的值

{

	"_index": "log",

	"_type": "parse_log",

	"_id": "AV80ztgqx-sSsZV5yS9j",

	"_version": 2,

	"_score": 1,

	"_source": {

		"ip": "1.1.1.1",

		"tag": "主任",

		"location": "北京市,北京市,",

		"url": [{

			"web": "/412/2014/01/16/2@13030.htm",

			"access_time": "2017-08-23T03:24:09",

			"during": "99999999",

			"url_id": "1"

		},

		{

			"web": "/412/2016/06/07/110@24757.htm",

			[b]"during": "888888",[/b]

			"url_id": "2",

			"access_time": "2017-09-11T03:47:03"

		}],

		"@timestamp": "2017-10-19 21:13:17"

	}

}

{

  "script": {

    "lang": "painless",

    "source": "ctx._source.url.url_id=params.new_url_id;ctx._source.url.during=params.new_during",

    "params": {

      "new_url_id": "2",

      "new_during": "0"

    }

  }

但是报错

{

	"caused_by": {

		"type": "script_exception",

		"reason": "runtime error",

		"script_stack": ["ctx._source.url.url_id=params.new_url_id;",

		" ^---- HERE"],

		"script": "ctx._source.url.url_id=params.new_url_id;ctx._source.url.during=params.new_during",

		"lang": "painless",

		"caused_by": {

			"type": "illegal_argument_exception",

			"reason": "Illegal list shortcut value [url_id]."

		}

	}

}