How do I disable the ${appName}.elasticbeanstalk.com URL?

Here's my scenario:

1. I have an Amazon EB application
2. I use a third party DNS/cache/attack-protection service (Cloudflare) instead of Route 53

Problem: Search engines are (also) crawling and indexing my ${appName}.elasticbeanstalk.com URL

Q: How do I disable the ${appName}.elasticbeanstalk.com URL for good to only use my chosen (.com) name?