fix #2394 xpack security run as header has changed

Author: Mpdreamz

src/Elasticsearch.Net/Connection/HttpConnection-CoreFx.cs

@@ -143,7 +143,7 @@ protected virtual HttpRequestMessage CreateRequestMessage(RequestData requestDat
 			requestMessage.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue(requestData.Accept));
 
 			if (!requestData.RunAs.IsNullOrEmpty())
-				requestMessage.Headers.Add("es-shield-runas-user", requestData.RunAs);
+				requestMessage.Headers.Add(RequestData.RunAsSecurityHeader, requestData.RunAs);
 
 			var data = requestData.PostData;
 

src/Elasticsearch.Net/Connection/HttpConnection.cs

@@ -52,7 +52,7 @@ protected virtual HttpWebRequest CreateWebRequest(RequestData requestData)
 				request.Headers.Add("Content-Encoding", "gzip");
 			}
 			if (!requestData.RunAs.IsNullOrEmpty())
-				request.Headers.Add("es-shield-runas-user", requestData.RunAs);
+				request.Headers.Add(RequestData.RunAsSecurityHeader, requestData.RunAs);
 
 			if (requestData.Headers != null && requestData.Headers.HasKeys())
 				request.Headers.Add(requestData.Headers);

src/Elasticsearch.Net/Transport/Pipeline/RequestData.cs

@@ -11,6 +11,7 @@ namespace Elasticsearch.Net
 	public class RequestData
 	{
 		public const string MimeType = "application/json";
+		public const string RunAsSecurityHeader = "es-security-runas-user";
 
 		public Uri Uri => new Uri(this.Node.Uri, this.Path).Purify();
 

src/Tests/XPack/Security/Role/PutRole/PutRoleApiTests.cs

@@ -93,7 +93,6 @@ protected override void ExpectResponse(IPutRoleResponse response)
 		}
 	}
 
-	//TODO this might be a bug in xpack but more likely a misunderstanding on our part ignore for now
 	public class PutRoleRunAsApiTests : PutRoleApiTests
 	{
 		public PutRoleRunAsApiTests(XPackCluster cluster, EndpointUsage usage) : base(cluster, usage) { }

src/Tests/XPack/Security/User/PutUser/PutUserApiTests.cs

@@ -75,7 +75,6 @@ protected override void ExpectResponse(IPutUserResponse response)
 		}
 	}
 
-	//TODO disabled for now pending bug report
 	public class PutUserRunAsApiTests : PutUserApiTests
 	{
 		public PutUserRunAsApiTests(XPackCluster cluster, EndpointUsage usage) : base(cluster, usage)