Support UpdateByQuery fluent method taking only selector

This aligns with 5.x. Provide an overload to UpdateByQuery() that accepts only the selector, setting Indices and Types to T.

Author: russcam

src/CodeGeneration/ApiGenerator/Domain/CsharpMethod.cs

@@ -191,7 +191,17 @@ public IEnumerable<Constructor> DescriptorConstructors()
 				{
 					doc += "\r\n" + string.Join("\t\t\r\n", cp.Select(p => $"///<param name=\"{p.Key}\"> this parameter is required</param>"));
 				}
-				var c = new Constructor { Generated = $"public {m}({par}) : base({routing}){{}}", Description = doc };
+
+				var generated = $"public {m}({par}) : base({routing}){{}}";
+
+				// Add typeof(T) as the default type when only index specified
+				if ((m == "UpdateByQueryDescriptor") && cp.Count() == 1 && !string.IsNullOrEmpty(this.RequestTypeGeneric))
+				{
+					var generic = this.RequestTypeGeneric.Replace("<", "").Replace(">", "");
+					generated = $"public {m}({par}) : base({routing}.Required(\"type\", (Types)typeof({generic}))){{}}";
+				}
+
+				var c = new Constructor { Generated = generated, Description = doc };
 				ctors.Add(c);
 			}
 			if (IsDocumentPath && !string.IsNullOrEmpty(this.DescriptorTypeGeneric))