Fix an omission from the previous commit around flat mappings.

Author: jtibshirani

server/src/main/java/org/elasticsearch/action/admin/indices/create/CreateIndexRequest.java

@@ -269,7 +269,7 @@ public CreateIndexRequest mapping(String type, Map<String, ?> source) {
      * ("field1", "type=string,store=true").
      */
     public CreateIndexRequest mapping(String type, Object... source) {
-        mapping(type, PutMappingRequest.buildFromSimplifiedDef(type, source));
+        mapping(type, PutMappingRequest.buildFromSimplifiedDef(source));
         return this;
     }