To demonstrate the effeciency of AWS Elastic Load Balancer, #EC2 User Data is a great option you can choose along with this script which will split CSV into EC2 using User Data, therefore you can test it before going Live.
sestok/Split-CSV-From-S3-into-EC2
A simple bash which splits CSV from S3 Buckets into EC2 User Data to Demonstrate Elastic Load Balancer efficiency.
Shell