fix transaction on addVertex

Author: rashtao

jnosql-tinkerpop/src/main/java/org/eclipse/jnosql/databases/tinkerpop/communication/DefaultTinkerpopGraphDatabaseManager.java

@@ -259,6 +259,7 @@ private Vertex addVertex(CommunicationEntity entity) {
         ).toArray();
         Vertex vertex = graph.addVertex(args);
         entity.add(ID, vertex.id());
+        GraphTransactionUtil.transaction(graph);
         return vertex;
     }