Validate existence of x-pack-core for 6.2.4+

This commit asserts that for integration tests running against 6.2.4+, plugin validation
checks for x-pack-core as opposed to x-pack; x-pack plugin was split out into separate
plugin names

Author: russcam

src/Tests/Framework/ManagedElasticsearch/Tasks/ValidationTasks/ValidatePluginsTask.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Linq;
 using Nest;
+using Tests.Document.Multiple.UpdateByQuery;
 using Tests.Framework.ManagedElasticsearch.Nodes;
 using Tests.Framework.ManagedElasticsearch.Plugins;
 
@@ -18,6 +19,14 @@ public override void Validate(IElasticClient client, NodeConfiguration configura
 				.ToList();
 
 			if (!requiredMonikers.Any()) return;
+
+			// 6.2.4 splits out X-Pack into separate plugin names
+			if (requiredMonikers.Contains(ElasticsearchPlugin.XPack.Moniker()) && TestClient.VersionUnderTestSatisfiedBy(">=6.2.4"))
+			{
+				requiredMonikers.Remove(ElasticsearchPlugin.XPack.Moniker());
+				requiredMonikers.Add(ElasticsearchPlugin.XPack.Moniker() + "-core");
+			}
+
 			var checkPlugins = client.CatPlugins();
 
 			if (!checkPlugins.IsValid)