Amazon just announced the expansion encryption ciphers to enable perfect forward secrecy.

To enable this feature, login to your AWS console and navigate to the Load Balancers section.

Select the loadbalancer and navigate to the Listerners section.

Click on Change under the Cipher Tab

Select ELBSecurityPolicy-2014-01 from the Predefined Security Policies and Save the changes.

You can test the new changes on Qualys SSL Tab to be sure perfect forward secrecy is enabled.