Delete unused old exception throwing

Author: russcam

src/Elasticsearch.Net/Elasticsearch.Net.csproj

@@ -84,7 +84,6 @@
     <Compile Include="ElasticLowLevelClient.Generated.cs" />
     <Compile Include="Exceptions\ElasticsearchClientException.cs" />
     <Compile Include="Exceptions\UnexpectedElasticsearchClientException.cs" />
-    <Compile Include="Extensions\ExceptionExtensions.cs" />
     <Compile Include="Extensions\Extensions.cs" />
     <Compile Include="Extensions\Fluent.cs" />
     <Compile Include="Extensions\FormattableString.cs" />

src/Elasticsearch.Net/Extensions/ExceptionExtensions.cs

@@ -1,30 +1,9 @@
 using System;
-using System.Reflection;
-using System.Runtime.ExceptionServices;
 
 namespace Nest
 {
     internal static class ExceptionExtensions
     {
-        private static readonly Lazy<MethodInfo> preserveStackTraceMethodInfo = new Lazy<MethodInfo>(() =>
-            typeof(Exception).GetMethod("InternalPreserveStackTrace", BindingFlags.Instance | BindingFlags.NonPublic)
-        );
-
-        public static void RethrowKeepingStackTrace(this Exception exception)
-        {
-            // In .Net 4.5 ExceptionDispatchInfo.Capture(exception).Throw();
-            // But as NEST also still targets .NET 4.0 the old internal hack must be used
-            if (preserveStackTraceMethodInfo.Value != null)
-            {
-#if NET45
-				preserveStackTraceMethodInfo.Value.Invoke(exception, null);
-#else
-				ExceptionDispatchInfo.Capture(exception).Throw();
-#endif
-			}
-            throw exception;
-        }
-
 		internal static T ThrowWhen<T>(this T @object, Func<T, bool> predicate, string exceptionMessage)
 		{
 			var x = predicate?.Invoke(@object);