code: public Observable<Void> beginCompleteRestoreAsync(String locationName, UUID operationId, String lastBackupName) {
          return beginCompleteRestoreWithServiceResponseAsync(locationName, operationId, lastBackupName).map(new Func1<ServiceResponse<Void>, Void>() {
              @Override
              public Void call(ServiceResponse<Void> response) {
                  return response.body();
              }
          });
      }
docs: Completes the restore operation on a managed database.
  
  @param locationName The name of the region where the resource is located.
  @param operationId Management operation id that this request tries to complete.
  @param lastBackupName The last backup name to apply
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceResponse} object if successful.