Remove unused method TestIfCodedEnum in ElementIndexer

Also remove an old comment that is outdated and no longer needed.

src/Spark.Engine/Search/ElementIndexer.cs

@@ -19,7 +19,6 @@
 
 namespace Spark.Engine.Search
 {
-    //This class is not static because it needs a IFhirModel to do some of the indexing (especially enums).
     public class ElementIndexer
     {
         private readonly SparkEngineEventSource _log = SparkEngineEventSource.Log;
@@ -42,21 +41,6 @@ private List<Expression> ListOf(params Expression[] args)
             return result;
         }
 
-        private bool TestIfCodedEnum(Type type)
-        {
-            if (type == null)
-            {
-                throw new ArgumentNullException("type");
-            }
-
-            bool? codedEnum = type.GenericTypeArguments?.FirstOrDefault()?.IsEnum;
-            if (codedEnum.HasValue && codedEnum.Value)
-            {
-                return true;
-            }
-            return false;
-        }
-
         /// <summary>
         /// Maps element to a list of Expression.
         /// </summary>