diff --git a/src/Elastic.Transport/Components/Pipeline/RequestPipeline.cs b/src/Elastic.Transport/Components/Pipeline/RequestPipeline.cs
index cfb287c..a5b9864 100644
--- a/src/Elastic.Transport/Components/Pipeline/RequestPipeline.cs
+++ b/src/Elastic.Transport/Components/Pipeline/RequestPipeline.cs
@@ -58,7 +58,7 @@ private RequestConfiguration PingAndSniffRequestConfiguration
 				PingTimeout = PingTimeout,
 				RequestTimeout = PingTimeout,
 				Authentication = _requestData.AuthenticationHeader,
-				EnableHttpPipelining = _requestData.HttpPipeliningEnabled,
+				HttpPipeliningEnabled = _requestData.HttpPipeliningEnabled,
 				ForceNode = _requestData.ForceNode
 			};
 
diff --git a/src/Elastic.Transport/Configuration/RequestConfiguration.cs b/src/Elastic.Transport/Configuration/RequestConfiguration.cs
index a7388fe..8506fef 100644
--- a/src/Elastic.Transport/Configuration/RequestConfiguration.cs
+++ b/src/Elastic.Transport/Configuration/RequestConfiguration.cs
@@ -181,7 +181,7 @@ public RequestConfiguration(IRequestConfiguration config)
 		Accept = config.Accept;
 		AllowedStatusCodes = config.AllowedStatusCodes;
 		Authentication = config.Authentication;
-		ClientCertificates = config.ClientCertificates;
+		ClientCertificates = (config.ClientCertificates is null) ? null : new X509CertificateCollection(config.ClientCertificates);
 		ContentType = config.ContentType;
 		DisableDirectStreaming = config.DisableDirectStreaming;
 		DisableAuditTrail = config.DisableAuditTrail;
@@ -230,18 +230,12 @@ public RequestConfiguration(IRequestConfiguration config)
 	/// <inheritdoc />
 	public bool? DisablePings { get; init; }
 
-	/// <inheritdoc />
-	public bool? DisablePing { get; init; } // TODO: ?
-
 	/// <inheritdoc />
 	public bool? DisableSniff { get; init; }
 
 	/// <inheritdoc />
 	public bool? HttpPipeliningEnabled { get; init; }
 
-	/// <inheritdoc />
-	public bool? EnableHttpPipelining { get; init; } = true; // TODO: ?
-
 	/// <inheritdoc />
 	public bool? EnableHttpCompression { get; init; }
 
@@ -306,7 +300,7 @@ public RequestConfigurationDescriptor(IRequestConfiguration? config)
 		_accept = config.Accept;
 		_allowedStatusCodes= config.AllowedStatusCodes;
 		_authentication = config.Authentication;
-		_clientCertificates = config.ClientCertificates;
+		_clientCertificates = (config.ClientCertificates is null) ? null : new X509CertificateCollection(config.ClientCertificates);;
 		_contentType = config.ContentType;
 		_disableDirectStreaming = config.DisableDirectStreaming;
 		_disableAuditTrail = config.DisableAuditTrail;
@@ -341,8 +335,10 @@ public RequestConfigurationDescriptor(IRequestConfiguration? config)
 	private bool? _disablePings;
 	private bool? _disableSniff;
 	private bool? _httpPipeliningEnabled;
+	private bool? _enableHttpCompression;
 	private Uri? _forceNode;
 	private int? _maxRetries;
+	private TimeSpan? _maxRetryTimeout; 
 	private string? _opaqueId;
 	private bool? _parseAllHeaders;
 	private TimeSpan? _pingTimeout;
@@ -356,11 +352,6 @@ public RequestConfigurationDescriptor(IRequestConfiguration? config)
 	private bool? _enableThreadPoolStats;
 	private RequestMetaData? _requestMetaData;
 
-#pragma warning disable CS0649 // Field is never assigned to, and will always have its default value
-	private bool? _enableHttpCompression; // TODO: ?
-	private TimeSpan? _maxRetryTimeout;   // TODO: ?
-#pragma warning restore CS0649 // Field is never assigned to, and will always have its default value
-
 	/// <inheritdoc cref="IRequestConfiguration.RunAs"/>
 	public RequestConfigurationDescriptor RunAs(string username)
 	{
@@ -466,6 +457,13 @@ public RequestConfigurationDescriptor MaxRetries(int retry)
 		return this;
 	}
 
+	/// <inheritdoc cref="IRequestConfiguration.MaxRetryTimeout"/>
+	public RequestConfigurationDescriptor MaxRetries(TimeSpan? timeout)
+	{
+		_maxRetryTimeout = timeout;
+		return this;
+	}
+
 	/// <inheritdoc cref="AuthorizationHeader"/>
 	public RequestConfigurationDescriptor Authentication(AuthorizationHeader authentication)
 	{
@@ -480,6 +478,13 @@ public RequestConfigurationDescriptor EnableHttpPipelining(bool enable = true)
 		return this;
 	}
 
+	/// <inheritdoc cref="IRequestConfiguration.EnableHttpCompression"/>
+	public RequestConfigurationDescriptor EnableHttpCompression(bool enable = true)
+	{
+		_enableHttpCompression = enable;
+		return this;
+	}
+
 	/// <inheritdoc cref="IRequestConfiguration.ClientCertificates"/>
 	public RequestConfigurationDescriptor ClientCertificates(X509CertificateCollection certificates)
 	{
diff --git a/tests/Elastic.Transport.Tests/Configuration/RequestConfigurationTests.cs b/tests/Elastic.Transport.Tests/Configuration/RequestConfigurationTests.cs
new file mode 100644
index 0000000..4380c75
--- /dev/null
+++ b/tests/Elastic.Transport.Tests/Configuration/RequestConfigurationTests.cs
@@ -0,0 +1,54 @@
+// Licensed to Elasticsearch B.V under one or more agreements.
+// Elasticsearch B.V licenses this file to you under the Apache 2.0 License.
+// See the LICENSE file in the project root for more information
+
+using System;
+using System.Security.Cryptography.X509Certificates;
+using System.Threading;
+using FluentAssertions;
+using Xunit;
+#if !NETFRAMEWORK
+using Soenneker.Utils.AutoBogus;
+#endif
+
+namespace Elastic.Transport.Tests.Configuration;
+
+public class RequestConfigurationTests
+{
+	[Fact]
+	public void CopiesAllDefaults()
+	{
+		var config = new RequestConfiguration();
+		var newConfig = new RequestConfiguration(config);
+
+		config.Should().BeEquivalentTo(newConfig);
+	}
+
+	[Fact]
+	public void SameDefaults()
+	{
+		IRequestConfiguration config = new RequestConfiguration();
+		IRequestConfiguration newConfig = new RequestConfigurationDescriptor();
+
+		config.Should().BeEquivalentTo(newConfig);
+	}
+
+#if !NETFRAMEWORK
+	[Fact]
+	public void CopiesAllProperties()
+	{
+		var autoFaker = new AutoFaker<RequestConfiguration>();
+		autoFaker.RuleFor(x => x.ClientCertificates, f => new X509CertificateCollection());
+
+		var config = autoFaker.Generate();
+		config.Accept.Should().NotBeEmpty();
+		config.ClientCertificates.Should().NotBeNull();
+
+		IRequestConfiguration newConfig = new RequestConfiguration(config);
+		config.Should().BeEquivalentTo(newConfig);
+
+		IRequestConfiguration newDescriptor = new RequestConfigurationDescriptor(config);
+		config.Should().BeEquivalentTo(newDescriptor);
+	}
+#endif
+}