Fix Count() executing a POST without request body

Logic was reversed when determining whether to execute a POST or GET
request.  If there's no source param, then it should be a GET, otherwise
POST.

Closes #898.

Author: gmarz

src/Nest/DSL/CountDescriptor.cs

@@ -19,11 +19,9 @@ internal static class CountPathInfo
 		public static void Update(ElasticsearchPathInfo<CountRequestParameters> pathInfo, ICountRequest request)
 		{
 			var source = request.RequestParameters.GetQueryStringValue<string>("source");
-			pathInfo.HttpMethod = !source.IsNullOrEmpty() 
+			pathInfo.HttpMethod = source.IsNullOrEmpty() 
 				? PathInfoHttpMethod.GET
 				: PathInfoHttpMethod.POST;
-		
-			pathInfo.HttpMethod = PathInfoHttpMethod.POST;
 		}
 	}
 

src/Tests/Nest.Tests.Integration/Core/CountTests.cs

@@ -0,0 +1,40 @@
+using FluentAssertions;
+using Nest.Tests.MockData.Domain;
+using NUnit.Framework;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Nest.Tests.Integration.Core
+{
+	[TestFixture]
+	public class CountTests : IntegrationTests
+	{
+		[Test]
+		public void CountTest()
+		{
+			var response = this.Client.Count<ElasticsearchProject>();
+
+			response.IsValid.Should().BeTrue();
+			response.Count.Should().BeGreaterThan(0);
+		}
+
+		[Test]
+		public void CountWithQueryTest()
+		{
+			var response = this.Client.Count<ElasticsearchProject>(c => c
+				.Query(q => q
+					.Match(m => m
+						.OnField(p => p.Country)
+						.Query("Sweden")
+					)
+				)
+			);
+
+			response.IsValid.Should().BeTrue();
+			response.Count.Should().BeGreaterThan(0);
+		}
+	}
+}

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

@@ -104,6 +104,7 @@
     <Compile Include="Connection\Thrift\ThiftBugReportTests.cs" />
     <Compile Include="Core\Bulk\BulkTests.cs" />
     <Compile Include="Core\Bulk\BulkUpdateTests.cs" />
+    <Compile Include="Core\CountTests.cs" />
     <Compile Include="Core\Explain\ExplainTests.cs" />
     <Compile Include="Core\Exists\AliasExists.cs" />
     <Compile Include="Core\GetFieldMapping\GetFieldMappingTests.cs" />