anchor.diff:  
   A special single bucket aggregation that enables aggregating nested documents.
   
  -For example, lets say we have a index of products, and each product holds the list of resellers - each having its own price for the product. The mapping could look like:
  +For example, lets say we have a index of products, and each product holds the list of resellers - each having its own
  +price for the product. The mapping could look like:
   
   [source,js]
   --------------------------------------------------
  
positive.code: }
  --------------------------------------------------
  
  As you can see above, the nested aggregation requires the `path` of the nested documents within the top level documents. Then one can define any type of aggregation over these nested documents.
  
  Response:
  
  
negative.code: {
      "aggregations": {
          "resellers": {
              "min_price": {
                  "value" : 350
              }
          }
      }
  }
  