docs: def cancel_operation(self, name, options=None):
          """
          Starts asynchronous cancellation on a long-running operation.  The server
          makes a best effort to cancel the operation, but success is not
          guaranteed.  If the server doesn't support this method, it returns
          ``google.rpc.Code.UNIMPLEMENTED``.  Clients can use
          ``Operations.GetOperation`` or
          other methods to check whether the cancellation succeeded or whether the
          operation completed despite cancellation. On successful cancellation,
          the operation is not deleted; instead, it becomes an operation with
          an ``Operation.error`` value with a ``google.rpc.Status.code`` of 1,
          corresponding to ``Code.CANCELLED``.
  
          Example:
            >>> from google.gapic.longrunning import operations_client
            >>> api = operations_client.OperationsClient()
            >>> name = ''
            >>> api.cancel_operation(name)
  
          Args:
            name (string): The name of the operation resource to be cancelled.
            options (:class:`google.gax.CallOptions`): Overrides the default
              settings for this call, e.g, timeout, retries etc.
  
          Raises:
            :exc:`google.gax.errors.GaxError` if the RPC is aborted.
            :exc:`ValueError` if the parameters are invalid.
          """
          # Create the request object.
          request = operations_pb2.CancelOperationRequest(name=name)
          self._cancel_operation(request, options)