anchor.diff:      "tweet" : {
           "properties" : {
               "image" : {
  -                "type" : "binary",
  +                "type" : "binary"
               }
           }
       }
  
positive.code:     "properties" : {
        "title" : { "type" : "string", "copy_to" : "meta_data" },
        "abstract" : { "type" : "string", "copy_to" : "meta_data" },
        "meta_data" : { "type" : "string" },
      }
  }
  --------------------------------------------------
  
negative.code:     "tweet" : {
          "properties" : {
              "hes_my_special_tweet" : {
                  "type" : "boolean"
              }
          }
      }
  