reverse misunderstanding - now just simply denote the reverse flag rather than interpret ascending or descending.

git-svn-id: https://svn.apache.org/repos/asf/lucene/java/trunk@150279 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/lucene/search/SortField.java

@@ -146,8 +146,9 @@ implements Serializable {
       default: buffer.append("\"" + field + "\"");
                break;
     }
-    
-    buffer.append(reverse ? " DESC" : " ASC");
+
+    if (reverse)
+      buffer.append('!');
 
     return buffer.toString();
   }