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 batch load task will be encrypted with a Timestream managed KMS key located in your account. For more information, see <a href="https://docs.aws.amazon.com/kms/latest/developerguide/concepts.html#aws-managed-cmk">Amazon Web Services managed keys</a>. <a href="https://docs.aws.amazon.com/timestream/latest/developerguide/ts-limits.html">Service quotas apply</a>. For details, see <a href="https://docs.aws.amazon.com/timestream/latest/developerguide/code-samples.create-batch-load.html">code sample</a>.