suggest忽略大小写

@@ -85,7 +85,8 @@ public class SearchServiceHelper {
         }
 
         if (isSuggest) {
-            WildcardQueryBuilder wildcardQueryBuilder = QueryBuilders.wildcardQuery("suggest", "*" + keyword + "*");
+            String lowKeyword = keyword.toLowerCase();
+            WildcardQueryBuilder wildcardQueryBuilder = QueryBuilders.wildcardQuery("suggest", "*" + lowKeyword + "*");
             return wildcardQueryBuilder;
         } else {
             //构建MultiMatch