Removed the indexes for the attributes of type Enum

git-svn-id: http://svn.code.sf.net/p/itop/code/trunk@420 a333f486-631f-4898-b8df-5754b55c2be0

core/attributedef.class.inc.php

@@ -925,7 +925,7 @@ class AttributeEnum extends AttributeString
 
 	public function RequiresIndex()
 	{
-		return true;
+		return false;
 	}
 
 	public function GetBasicFilterOperators()