elasticsearch sort error

"_id": "25802",
    "_version": 1,
    "found": true,
    "_source": {
        "pid": "25799",
        "sort": "999",
        "title": "222",
        "content": "<p>2222</p>",
        "editor_type": "1",
        "username": "",
        "update_time": "2020-07-15 14:50:29",
        "articleId": 25802,
        "status": 1,
        "view": 0,
        "create_time": "2020-07-15 14:50:29"
    }
这是文章内容
es版本是5.6.3
 

{

    "sort": [

        "_score",

        {"view":{"order":"desc"}}

    ],

    "query":{

        "multi_match":{

            "query":"vpn",

            "fields":[ "title", "content"]

        }

    },

    "highlight":{

        "fields":{

            "content":{

                "fragment_size":200,

                "type": "unified",

                "highlight_query": {

                    "bool": {

                        "must": {

                            "match": {

                                "content": {

                                    "query": "vpn"

                                }

                            }

                        },

                        "minimum_should_match": 1

                    }

                }

            },

            "title":{

                "fragment_size":200,

                "type": "unified",

                "highlight_query": {

                    "bool": {

                        "must": {

                            "match": {

                                "title": {

                                    "query": "vpn"

                                }

                            }

                        },

                        "minimum_should_match": 1

                    }

                }

            }

        }

    }

}

"root_cause": [
            {
                "type": "illegal_argument_exception",
                "reason": "Fielddata is disabled on text fields by default. Set fielddata=true on [view] in order to load fielddata in memory by uninverting the inverted index. Note that this can however use significant memory. Alternatively use a keyword field instead."
            }
        ],

view的type不是integer类型么，为什么还说是text fields
新手，望指教