anchor.diff:                  "failed" : 0,
               },
               "total" : 3,
  -            "matches" : ["1", "2", "3"]
  +            "matches" : [
  +                {
  +                    "_index": "twitter",
  +                    "_id": "1"
  +                },
  +                {
  +                    "_index": "twitter",
  +                    "_id": "2"
  +                },
  +                {
  +                    "_index": "twitter",
  +                    "_id": "3"
  +                }
  +            ]
           },
           {
               "took" : 12,
  
positive.code: [source,js]
  --------------------------------------------------
  {
      "items" : [
          {
              "took" : 24,
              "_shards" : {
  
negative.code:                 "failed" : 0,
              },
              "total" : 3,
              "matches" : [
                  {
                      "_index": "twitter",
                      "_id": "4"
                  },
                  {
                      "_index": "twitter",
                      "_id": "5"
                  },
                  {
                      "_index": "twitter",
                      "_id": "6"
                  }
               ]
          },
          {
              "error" : "DocumentMissingException[[_na][_na] [user][3]: document missing]"
          },
          {
              "took" : 12,
  