Log into your AWS account, On AWS console, Go to Your Load Balancer then go to Listeners, Select "edit rules" on your http listener.
Delete all extra rules except the default one.
Now edit the default rule and choose "Redirect to " as an action and enter "443" as the port.
For more information, you can read here
Want to be an AWS Expert, Come & join: AWS Training
To know more about ELB, checkout: