final CustomField updates = CustomField.builder()
.setFieldValue(CustomField.Field.Label, newName)
.build();
final DataServiceUpdateCustomFieldOperation updater = new DataServiceUpdateCustomFieldOperation(fieldId, updates);
final Boolean success = client.call(updater);
System.out.println("Update custom field: " + success);
final DataServiceLoadOperation<CustomField, CustomField> loader = new DataServiceLoadOperation<CustomField, CustomField>(CustomField.class, fieldId);