Creates a new Timestream batch load task. A batch load task processes data from a CSV source in an S3 location and writes to a Timestream table. A mapping from source to target is defined in a batch load task. Errors and events are written to a report at an S3 location. For the report, if the KMS key is not specified, the report will be encrypted with an S3 managed key when SSE_S3 is the option. Otherwise an error is thrown. For more information, see Amazon Web Services managed keys. Service quotas apply. For details, see code sample.