Cancels an export task in progress that is exporting a snapshot or cluster to Amazon S3. Any data that has already been written to the S3 bucket isn't removed.
See https://www.paws-r-sdk.com/docs/rds_cancel_export_task/ for full documentation.
rds_cancel_export_task(ExportTaskIdentifier)
[required] The identifier of the snapshot or cluster export task to cancel.