Add Accept header to requests

See https://www.elastic.co/guide/en/elasticsearch/reference/master/breaking_50_cat_api.html

Remove Host property from CatNodes
Add bytes_recovered and files_recovered to cat recovery
Rename total_files and total_bytes to files_total and bytes_total, respectively
Rename translog to translog_ops_recovered
Rename translog_total to translog_ops
Rename translog_percent to translog_ops_percent

Closes #2012

Author: russcam

Diff for: src/CodeGeneration/CodeGeneration.LowLevelClient/Views/ElasticLowLevelClient.Generated.cshtml

@@ -51,7 +51,7 @@ namespace Elasticsearch.Net
 			}
 		<text>@Raw(@"///<param name=""requestParameters"">A func that allows you to describe the querystring parameters &amp; request specific connection settings.</param>")</text>
 		<text>public @Raw(method.ReturnType) @(method.FullName)@(Raw(method.ReturnTypeGeneric))(@Raw(method.Arguments))
-			where @method.CallTypeGeneric : class => this.@(requestMethod)@(Raw("<" + method.CallTypeGeneric +">"))(@method.HttpMethod, Url($"@(Raw(patchedUrl))"), @(method.Parts.Any(pp=>pp.Name == "body") ? "body" : "null"), _params(requestParameters@(method.Allow404 ? ", allow404: true" :"")@(Raw(url.StartsWith("_cat") ? ", contentType: \"text/plain\"" : ""))));
+			where @method.CallTypeGeneric : class => this.@(requestMethod)@(Raw("<" + method.CallTypeGeneric +">"))(@method.HttpMethod, Url($"@(Raw(patchedUrl))"), @(method.Parts.Any(pp=>pp.Name == "body") ? "body" : "null"), _params(requestParameters@(method.Allow404 ? ", allow404: true" :"")@(Raw(url.StartsWith("_cat") ? ", contentType: \"text/plain\", accept: \"text/plain\"" : ""))));
 		</text>
 		}
 	}

Diff for: src/Elasticsearch.Net/Configuration/RequestConfiguration.cs

@@ -4,7 +4,7 @@
 
 namespace Elasticsearch.Net
 {
-	public interface IRequestConfiguration 
+	public interface IRequestConfiguration
 	{
 		/// <summary>
 		/// The timeout for this specific request, takes precedence over the global timeout settings
@@ -17,10 +17,15 @@ public interface IRequestConfiguration
 		TimeSpan? PingTimeout { get; set;  }
 
 		/// <summary>
-		/// Force a difference content type header on the request
+		/// Force a different Content-Type header on the request
 		/// </summary>
 		string ContentType { get; set; }
-		
+
+		/// <summary>
+		/// Force a different Accept header on the request
+		/// </summary>
+		string Accept { get; set; }
+
 		/// <summary>
 		/// This will override whatever is set on the connection configuration or whatever default the connectionpool has.
 		/// </summary>
@@ -32,13 +37,13 @@ public interface IRequestConfiguration
 		Uri ForceNode { get; set; }
 
 		/// <summary>
-		/// Forces no sniffing to occur on the request no matter what configuration is in place 
+		/// Forces no sniffing to occur on the request no matter what configuration is in place
 		/// globally
 		/// </summary>
 		bool? DisableSniff { get; set; }
 
 		/// <summary>
-		/// Under no circumstance do a ping before the actual call. If a node was previously dead a small ping with 
+		/// Under no circumstance do a ping before the actual call. If a node was previously dead a small ping with
 		/// low connect timeout will be tried first in normal circumstances
 		/// </summary>
 		bool? DisablePing { get; set; }
@@ -70,6 +75,7 @@ public class RequestConfiguration : IRequestConfiguration
 		public TimeSpan? RequestTimeout { get; set; }
 		public TimeSpan? PingTimeout { get; set; }
 		public string ContentType { get; set; }
+		public string Accept { get; set; }
 		public int? MaxRetries { get; set; }
 		public Uri ForceNode { get; set; }
 		public bool? DisableSniff { get; set; }
@@ -87,17 +93,19 @@ public class RequestConfigurationDescriptor : IRequestConfiguration
 		TimeSpan? IRequestConfiguration.RequestTimeout { get; set; }
 
 		TimeSpan? IRequestConfiguration.PingTimeout { get; set; }
-	
+
 		string IRequestConfiguration.ContentType { get; set; }
-		
+
+		string IRequestConfiguration.Accept { get; set; }
+
 		int? IRequestConfiguration.MaxRetries { get; set; }
-		
+
 		Uri IRequestConfiguration.ForceNode { get; set; }
-		
+
 		bool? IRequestConfiguration.DisableSniff { get; set; }
-		
+
 		bool? IRequestConfiguration.DisablePing { get; set; }
-		
+
 		IEnumerable<int> IRequestConfiguration.AllowedStatusCodes { get; set; }
 
 		BasicAuthenticationCredentials IRequestConfiguration.BasicAuthenticationCredentials { get; set; }
@@ -118,9 +126,15 @@ public RequestConfigurationDescriptor PingTimeout(TimeSpan pingTimeout)
 			return this;
 		}
 
-		public RequestConfigurationDescriptor AcceptContentType(string acceptContentTypeHeader)
+		public RequestConfigurationDescriptor ContentType(string contentTypeHeader)
+		{
+			Self.ContentType = contentTypeHeader;
+			return this;
+		}
+
+		public RequestConfigurationDescriptor Accept(string acceptHeader)
 		{
-			Self.ContentType = acceptContentTypeHeader;
+			Self.Accept = acceptHeader;
 			return this;
 		}
 
@@ -179,4 +193,4 @@ public RequestConfigurationDescriptor EnableHttpPipelining(bool enable = true)
 			return this;
 		}
 	}
-}
+}

Diff for: src/Elasticsearch.Net/Connection/HttpConnection.cs

@@ -36,7 +36,7 @@ protected virtual HttpWebRequest CreateWebRequest(RequestData requestData)
 		{
 			var request = (HttpWebRequest)WebRequest.Create(requestData.Uri);
 
-			request.Accept = requestData.ContentType;
+			request.Accept = requestData.Accept;
 			request.ContentType = requestData.ContentType;
 
 			request.MaximumResponseHeadersLength = -1;