Multiple value in a terms stats

gistfile1.txt

curl -X GET '127.0.0.1:9200/octoly-development-videos/video/_search?from=0&size=20&pretty' -d '{
  "query":{
    "bool":{
      "must":[
        {
          "query_string":{
            "query":"*",
            "default_operator":"AND"
          }
        }
      ],
      "should":[
        {
          "bool":{}
        }
      ],
      "minimum_should_match":1
    }
  },
  "sort":[
    {
      "views_count":"desc"
    }
  ],
  "facets":{
    "views_count":{
      "statistical":{
        "field":"views_count"
      }
    },
    "comments_count":{
      "statistical":{
        "field":"comments_count"
      }
    },
    "likes_count":{
      "statistical":{
        "field":"likes_count"
      }
    },
    "dislikes_count":{
      "statistical":{
        "field":"dislikes_count"
      }
    },
    "advanced_stats":{
      "terms_stats":{
        "key_field":"brand_ids",
        "value_script": doc['views_count'].value + doc['likes_count'].value + doc['dislikes_count'].value,
        "size":5
      }
    }
  },
  "size":20,
  "from":0
}'