Fix #1403: Extended stats not read to completion

Author: gmarz

src/Nest/Resolvers/Converters/Aggregations/AggregationConverter.cs

@@ -239,6 +239,8 @@ private IAggregation GetExtendedStatsAggregation(StatsMetric statsMetric, JsonRe
 					bounds.Lower = reader.Value as double?;
 				}
 				extendedStatsMetric.StdDeviationBounds = bounds;
+				reader.Read();
+				reader.Read();
 			}
 
 			return extendedStatsMetric;

src/Tests/Nest.Tests.Integration/Nest.Tests.Integration.csproj

@@ -176,6 +176,7 @@
     <Compile Include="Reproduce\Reproduce1278Tests.cs" />
     <Compile Include="Reproduce\Reproduce1304Tests.cs" />
     <Compile Include="Reproduce\Reproduce1317Tests.cs" />
+    <Compile Include="Reproduce\Reproduce1403Tests.cs" />
     <Compile Include="Reproduce\Reproduce769Tests.cs" />
     <Compile Include="Reproduce\Reproduce945Tests.cs" />
     <Compile Include="Reproduce\Reproduce953Tests.cs" />

src/Tests/Nest.Tests.Integration/Reproduce/Reproduce1403Tests.cs

@@ -0,0 +1,31 @@
+using Nest.Tests.MockData.Domain;
+using NUnit.Framework;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using FluentAssertions;
+using Elasticsearch.Net;
+
+namespace Nest.Tests.Integration.Reproduce
+{
+	[TestFixture]
+	public class Reproduce1403Tests : IntegrationTests
+	{
+		[Test]
+		public void ExtendedStatsNotReadToCompletion()
+		{
+			var result = this.Client.Search<ElasticsearchProject>(s => s
+				.SearchType(SearchType.Count)
+				.Aggregations(a => a
+					.ExtendedStats("a", stats => stats.Field(p => p.LongValue))
+					.ExtendedStats("b", stats => stats.Field(p => p.LOC))
+				)
+			);
+
+			result.IsValid.Should().BeTrue();
+			result.Aggregations.Count.Should().Be(2);
+		}
+	}
+}