[Backport 7.x] Update boxplot to handle non-numeric values

src/Nest/Aggregations/AggregateFormatter.cs

@@ -251,39 +251,41 @@ private IAggregate GetMatrixStatsAggregate(ref JsonReader reader, IJsonFormatter
 
 		private IAggregate GetBoxplotAggregate(ref JsonReader reader, IJsonFormatterResolver formatterResolver, IReadOnlyDictionary<string, object> meta)
 		{
+			var nullableDoubleFormatter = new StringDoubleFormatter();
+
 			var boxplot = new BoxplotAggregate
 			{
-				Min = reader.ReadDouble(),
+				Min = nullableDoubleFormatter.Deserialize(ref reader, formatterResolver),
 				Meta = meta
 			};
 			reader.ReadNext(); // ,
 			reader.ReadNext(); // "max"
 			reader.ReadNext(); // :
-			boxplot.Max = reader.ReadDouble();
+			boxplot.Max = nullableDoubleFormatter.Deserialize(ref reader, formatterResolver);
 			reader.ReadNext(); // ,
 			reader.ReadNext(); // "q1"
 			reader.ReadNext(); // :
-			boxplot.Q1 = reader.ReadDouble();
+			boxplot.Q1 = nullableDoubleFormatter.Deserialize(ref reader, formatterResolver);
 			reader.ReadNext(); // ,
 			reader.ReadNext(); // "q2"
 			reader.ReadNext(); // :
-			boxplot.Q2 = reader.ReadDouble();
+			boxplot.Q2 = nullableDoubleFormatter.Deserialize(ref reader, formatterResolver);
 			reader.ReadNext(); // ,
 			reader.ReadNext(); // "q3"
 			reader.ReadNext(); // :
-			boxplot.Q3 = reader.ReadDouble();
+			boxplot.Q3 = nullableDoubleFormatter.Deserialize(ref reader, formatterResolver);
 
 			var token = reader.GetCurrentJsonToken();
 			if (token != JsonToken.EndObject)
 			{
 				reader.ReadNext(); // ,
 				reader.ReadNext(); // "lower"
 				reader.ReadNext(); // :
-				boxplot.Lower = reader.ReadDouble();
+				boxplot.Lower = nullableDoubleFormatter.Deserialize(ref reader, formatterResolver);
 				reader.ReadNext(); // ,
 				reader.ReadNext(); // "upper"
 				reader.ReadNext(); // :
-				boxplot.Upper = reader.ReadDouble();
+				boxplot.Upper = nullableDoubleFormatter.Deserialize(ref reader, formatterResolver);
 			}
 
 			return boxplot;

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

@@ -2,22 +2,31 @@
 // Elasticsearch B.V licenses this file to you under the Apache 2.0 License.
 // See the LICENSE file in the project root for more information
 
+using Elasticsearch.Net.Utf8Json;
+
 namespace Nest
 {
 	public class BoxplotAggregate : MetricAggregateBase
 	{
+		[JsonFormatter(typeof(StringDoubleFormatter))]
 		public double Min { get; set; }
 
+		[JsonFormatter(typeof(StringDoubleFormatter))]
 		public double Max { get; set; }
 
+		[JsonFormatter(typeof(StringDoubleFormatter))]
 		public double Q1 { get; set; }
 
+		[JsonFormatter(typeof(StringDoubleFormatter))]
 		public double Q2 { get; set; }
 
+		[JsonFormatter(typeof(StringDoubleFormatter))]
 		public double Q3 { get; set; }
 
+		[JsonFormatter(typeof(StringDoubleFormatter))]
 		public double Lower { get; set; }
 
+		[JsonFormatter(typeof(StringDoubleFormatter))]
 		public double Upper { get; set; }
 	}
 }

src/Nest/CommonAbstractions/SerializationBehavior/JsonFormatters/NullableStringBooleanFormatter.cs

@@ -172,6 +172,13 @@ internal class NullableStringDoubleFormatter : IJsonFormatter<double?>
 					return null;
 				case JsonToken.String:
 					var s = reader.ReadString();
+
+					if (s.Equals("Infinity", System.StringComparison.Ordinal))
+						return double.PositiveInfinity;
+
+					if (s.Equals("-Infinity", System.StringComparison.Ordinal))
+						return double.NegativeInfinity;
+
 					if (!double.TryParse(s, out var d))
 						throw new JsonParsingException($"Cannot parse {typeof(double).FullName} from: {s}");
 
@@ -194,4 +201,39 @@ public void Serialize(ref JsonWriter writer, double? value, IJsonFormatterResolv
 			writer.WriteDouble(value.Value);
 		}
 	}
+
+	internal class StringDoubleFormatter : IJsonFormatter<double>
+	{
+		public double Deserialize(ref JsonReader reader, IJsonFormatterResolver formatterResolver)
+		{
+			var token = reader.GetCurrentJsonToken();
+			switch (token)
+			{
+				case JsonToken.Null:
+					throw new JsonParsingException($"Cannot parse non-nullable double value from: {token}.");
+
+				case JsonToken.String:
+					var s = reader.ReadString();
+
+					if (s.Equals("Infinity", System.StringComparison.Ordinal))
+						return double.PositiveInfinity;
+
+					if (s.Equals("-Infinity", System.StringComparison.Ordinal))
+						return double.NegativeInfinity;
+
+					if (!double.TryParse(s, out var d))
+						throw new JsonParsingException($"Cannot parse {typeof(double).FullName} from: {s}");
+
+					return d;
+
+				case JsonToken.Number:
+					return reader.ReadDouble();
+
+				default:
+					throw new JsonParsingException($"Cannot parse {typeof(double).FullName} from: {token}");
+			}
+		}
+
+		public void Serialize(ref JsonWriter writer, double value, IJsonFormatterResolver formatterResolver) => writer.WriteDouble(value);
+	}
 }

tests/Tests.Reproduce/GitHubIssue6050.cs

@@ -0,0 +1,75 @@
+// Licensed to Elasticsearch B.V under one or more agreements.
+// Elasticsearch B.V licenses this file to you under the Apache 2.0 License.
+// See the LICENSE file in the project root for more information
+
+using System;
+using System.Text;
+using Elastic.Elasticsearch.Xunit.XunitPlumbing;
+using Elasticsearch.Net;
+using FluentAssertions;
+using Nest;
+
+namespace Tests.Reproduce
+{
+	public class GitHubIssue6050
+	{
+		private static readonly byte[] ResponseBytes = Encoding.UTF8.GetBytes(@"{
+  ""took"" : 1,
+  ""timed_out"" : false,
+  ""_shards"" : {
+    ""total"" : 1,
+    ""successful"" : 1,
+    ""skipped"" : 0,
+    ""failed"" : 0
+  },
+  ""hits"" : {
+    ""total"" : {
+      ""value"" : 0,
+      ""relation"" : ""eq""
+    },
+    ""max_score"" : null,
+    ""hits"" : [ ]
+  },
+  ""aggregations"" : {
+    ""summary_boxplot"" : {
+      ""min"" : ""Infinity"",
+      ""max"" : ""-Infinity"",
+      ""q1"" : ""NaN"",
+      ""q2"" : ""NaN"",
+      ""q3"" : ""NaN"",
+      ""lower"" : ""NaN"",
+      ""upper"" : ""-Infinity""
+    }
+  }
+}");
+
+		[U]
+		public void BoxplotHandlesNaNValues()
+		{
+			var pool = new SingleNodeConnectionPool(new Uri($"http://localhost:9200"));
+			var settings = new ConnectionSettings(pool, new InMemoryConnection(ResponseBytes));
+			var client = new ElasticClient(settings);
+
+			var response = client.Search<TestData>(s => s
+				.Size(0)
+				.Index("test")
+				.Aggregations(a => a
+					.Boxplot("summary_boxplot", mt => mt.Field(f => f.Population))));
+
+			var boxplot = response.Aggregations.Boxplot("summary_boxplot");
+
+			double.IsNaN(boxplot.Lower).Should().BeTrue();
+			double.IsNaN(boxplot.Q1).Should().BeTrue();
+			double.IsNaN(boxplot.Q2).Should().BeTrue();
+			double.IsNaN(boxplot.Q3).Should().BeTrue();
+			double.IsInfinity(boxplot.Min).Should().BeTrue();
+			double.IsNegativeInfinity(boxplot.Max).Should().BeTrue();
+			double.IsNegativeInfinity(boxplot.Upper).Should().BeTrue();
+		}
+
+		private class TestData
+		{
+			public long Population { get; set; }
+		}
+	}
+}