code: func (c *Redshift) AcceptReservedNodeExchange(input *AcceptReservedNodeExchangeInput) (*AcceptReservedNodeExchangeOutput, error) {
  	req, out := c.AcceptReservedNodeExchangeRequest(input)
  	return out, req.Send()
  }
docs: // AcceptReservedNodeExchange API operation for Amazon Redshift.
  //
  // Exchanges a DC1 Reserved Node for a DC2 Reserved Node with no changes to
  // the configuration (term, payment type, or number of nodes) and no additional
  // costs.
  //
  // Returns awserr.Error for service API and SDK errors. Use runtime type assertions
  // with awserr.Error's Code and Message methods to get detailed information about
  // the error.
  //
  // See the AWS API reference guide for Amazon Redshift's
  // API operation AcceptReservedNodeExchange for usage and error information.
  //
  // Returned Error Codes:
  //   * ErrCodeReservedNodeNotFoundFault "ReservedNodeNotFound"
  //   The specified reserved compute node not found.
  //
  //   * ErrCodeInvalidReservedNodeStateFault "InvalidReservedNodeState"
  //   Indicates that the Reserved Node being exchanged is not in an active state.
  //
  //   * ErrCodeReservedNodeAlreadyMigratedFault "ReservedNodeAlreadyMigrated"
  //   Indicates that the reserved node has already been exchanged.
  //
  //   * ErrCodeReservedNodeOfferingNotFoundFault "ReservedNodeOfferingNotFound"
  //   Specified offering does not exist.
  //
  //   * ErrCodeUnsupportedOperationFault "UnsupportedOperation"
  //   The requested operation isn't supported.
  //
  //   * ErrCodeDependentServiceUnavailableFault "DependentServiceUnavailableFault"
  //   Your request cannot be completed because a dependent internal service is
  //   temporarily unavailable. Wait 30 to 60 seconds and try again.
  //
  //   * ErrCodeReservedNodeAlreadyExistsFault "ReservedNodeAlreadyExists"
  //   User already has a reservation with the given identifier.
  //
  // See also, https://docs.aws.amazon.com/goto/WebAPI/redshift-2012-12-01/AcceptReservedNodeExchange