anchor.diff:  [source,js]
   --------------------------------------------------
   {
  -    "items" : [
  +    "responses" : [
           {
               "took" : 24,
               "_shards" : {
  
positive.code:                 "failed" : 0,
              },
              "total" : 3,
              "matches" : ["1", "2", "3"]
          },
          {
              "took" : 12,
  
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,
  