Handle additional JSON properties (#5139)

* Handle additional JSON properties

* PR feedback - add comment

Author: stevejgordon

src/Nest/Aggregations/AggregateFormatter.cs

@@ -258,6 +258,24 @@ private IAggregate GetBoxplotAggregate(ref JsonReader reader, IJsonFormatterReso
 			reader.ReadNext(); // "q3"
 			reader.ReadNext(); // :
 			boxplot.Q3 = reader.ReadDouble();
+
+			// ES 7.11.0 adds these two additional properties on the payload
+			// When present on a 7.11 response, we avoid an exception by
+			// handling (and skipping) over the properties. The 7.11 client
+			// will add support for these new properties on BoxplotAggregate.
+			var token = reader.GetCurrentJsonToken();
+			if (token != JsonToken.EndObject)
+			{
+				reader.ReadNext(); // ,
+				reader.ReadNext(); // "lower"
+				reader.ReadNext(); // :
+				reader.ReadDouble();
+				reader.ReadNext(); // ,
+				reader.ReadNext(); // "upper"
+				reader.ReadNext(); // :
+				reader.ReadDouble();
+			}
+
 			return boxplot;
     }