code: func (c *Redshift) ModifyClusterIamRoles(input *ModifyClusterIamRolesInput) (*ModifyClusterIamRolesOutput, error) {
  	req, out := c.ModifyClusterIamRolesRequest(input)
  	return out, req.Send()
  }
docs: // ModifyClusterIamRoles API operation for Amazon Redshift.
  //
  // Modifies the list of AWS Identity and Access Management (IAM) roles that
  // can be used by the cluster to access other AWS services.
  //
  // A cluster can have up to 10 IAM roles associated at any time.
  //
  // 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 ModifyClusterIamRoles for usage and error information.
  //
  // Returned Error Codes:
  //   * ErrCodeInvalidClusterStateFault "InvalidClusterState"
  //   The specified cluster is not in the available state.
  //
  //   * ErrCodeClusterNotFoundFault "ClusterNotFound"
  //   The ClusterIdentifier parameter does not refer to an existing cluster.
  //
  // See also, https://docs.aws.amazon.com/goto/WebAPI/redshift-2012-12-01/ModifyClusterIamRoles