Update BoxplotAggregate response (#5133)

In 7.11 the boxplot aggregation response includes two additional
properties, lower and upper. I've added these to our type and updated
the deserialization to handle these when present.

Author: stevejgordon

src/Nest/Aggregations/AggregateFormatter.cs

@@ -258,6 +258,20 @@ private IAggregate GetBoxplotAggregate(ref JsonReader reader, IJsonFormatterReso
 			reader.ReadNext(); // "q3"
 			reader.ReadNext(); // :
 			boxplot.Q3 = reader.ReadDouble();
+
+			var token = reader.GetCurrentJsonToken();
+			if (token != JsonToken.EndObject)
+			{
+				reader.ReadNext(); // ,
+				reader.ReadNext(); // "lower"
+				reader.ReadNext(); // :
+				boxplot.Lower = reader.ReadDouble();
+				reader.ReadNext(); // ,
+				reader.ReadNext(); // "upper"
+				reader.ReadNext(); // :
+				boxplot.Upper = reader.ReadDouble();
+			}
+
 			return boxplot;
     }
 

src/Nest/Aggregations/Metric/Boxplot/BoxplotAggregate.cs

@@ -15,5 +15,9 @@ public class BoxplotAggregate : MetricAggregateBase
 		public double Q2 { get; set; }
 
 		public double Q3 { get; set; }
+
+		public double Lower { get; set; }
+
+		public double Upper { get; set; }
 	}
 }

tests/Tests/Aggregations/Metric/Boxplot/BoxplotAggregationUsageTests.cs

@@ -77,6 +77,8 @@ protected override void ExpectResponse(ISearchResponse<Project> response)
 			boxplot.Q1.Should().BeGreaterOrEqualTo(0);
 			boxplot.Q2.Should().BeGreaterOrEqualTo(0);
 			boxplot.Q3.Should().BeGreaterOrEqualTo(0);
+			boxplot.Lower.Should().BeGreaterOrEqualTo(0);
+			boxplot.Upper.Should().BeGreaterOrEqualTo(0);
 			boxplot.Meta.Should().NotBeNull().And.HaveCount(1);
 			boxplot.Meta["foo"].Should().Be("bar");
 		}