how to insert data in cloud datastore

                DatastoreService datastore = DatastoreServiceFactory.getDatastoreService();
                //you must have cutsomers entity in your datastore
                Query userQuery = new Query("customers");
                //filter
                Query.Filter nameFilter = new Query.FilterPredicate("email",
                        Query.FilterOperator.EQUAL, email);

                userQuery.setFilter(nameFilter);
                //populate aslist
                List<Entity> dbUsers = datastore.prepare(userQuery).asList(FetchOptions.Builder.withDefaults());
                if (dbUsers.isEmpty()) {
                
                Entity userEntity = new Entity("customers");
                    userEntity.setProperty("meterID", meter);
                    userEntity.setProperty("address", address);
                    userEntity.setProperty("dateofcreation", new Date());
                    userEntity.setProperty("email", email);
                    userEntity.setProperty("enable", enable);
                    userEntity.setProperty("givenName", Gname);
                    userEntity.setProperty("surName", Sname);
                    userEntity.setProperty("secret", password);
                    userEntity.setProperty("mread", mread);
                    datastore.put(userEntity);
                
                }