Added reproduce for #3412 to show %2A is valid to send as wildcard:

Author: Mpdreamz

src/Tests/Tests.Reproduce/GithubIssue3412.cs

@@ -0,0 +1,27 @@
+using FluentAssertions;
+using System.Linq;
+using Elastic.Xunit.XunitPlumbing;
+using Tests.Core.ManagedElasticsearch.Clusters;
+using Tests.Domain;
+
+namespace Tests.Reproduce
+{
+	public class GithubIssue3412 : IClusterFixture<WritableCluster>
+	{
+		private readonly WritableCluster _cluster;
+
+		public GithubIssue3412(WritableCluster cluster) => _cluster = cluster;
+
+		[I]
+		public void WildcardBeingEscapedHasNoBarringsOnResult()
+		{
+			var indexedDocument1 = _cluster.Client.Index(new Project { Name = "project-1" }, d => d.Index("prefixed-1"));
+			var indexedDocument2 = _cluster.Client.Index(new Project { Name = "project-2" }, d => d.Index("prefixed-2"));
+			var refresh = _cluster.Client.Refresh("prefixed-*");
+			var search = _cluster.Client.Search<Project>(s => s.Index("prefixed-*"));
+			search.Total.Should().Be(2);
+			var queriedIndices = search.Hits.Select(h => h.Index).ToArray();
+			queriedIndices.Should().BeEquivalentTo(new[] {"prefixed-1", "prefixed-2"});
+		}
+	}
+}