fix sortListBySortField bug

@@ -126,7 +126,7 @@ public class AggCommonHelper {
 		}
 		// 再按照某个字段对商品排序
 		FieldSortOrder fieldSortOrder = new FieldSortOrder(topHitOrder);
-		boolean isDesc = fieldSortOrder.getSortField().equals(SortOrder.DESC) ? true : false;
+		boolean isDesc = fieldSortOrder.getSortField().equals(SortOrder.DESC.toString()) ? true : false;
 		Collections.sort(productList, new Comparator<Map<String, Object>>() {
 			public int compare(Map<String, Object> o1, Map<String, Object> o2) {
 				try {
@@ -214,4 +214,5 @@ public class AggCommonHelper {
 		}
 		return results;
 	}
+	
 }