If your data in CloudWatch Log won't be too big, then it's fine to use the AWS Add-on CloudWatchLog mod input to collect it. Otherwise, we recommend you use Kinesis stream and the Kinesis mod input: http://docs.splunk.com/Documentation/AddOns/released/AWS/CloudWatchLogs
You can use the AWS TA web UI to configure the CloudWatchLog input http://.../en-US/app/Splunk_TA_aws/inputs, the logGroup fields can be a list of log groups, such as /aws/lambda/s3table-chalice,/aws/lambda/ListBucketInfo,/aws/lambda/NoOp,/aws/lambda/GetBucketInfo,/aws/lambda/UpdateBucketInfo
If you are using the distributed environment of Splunk Cloud with heavyweight forwarder to collect AWS data, then yes, pls raise a ticket. Otherwise, for single instance Splunk Cloud instance, you can use the web UI to configure the CloudWatchLog input by yourself. Hope it helps.
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