$util.validate($util.matches("^[0-9a-f]{8}(?:[0-9a-f]{4}){3}[0-9a-f]{12}$", $ctx.args.eksClusterId), "Invalid ID")
$util.validate($util.matches("^[0-9a-f]{8}-(?:[0-9a-f]{4}-){3}[0-9a-f]{12}$", $ctx.args.ingestionId), "Invalid ingestionId")

{"version": "2017-02-28", "operation": "Invoke", "payload": $util.toJson($ctx)}