How to access AWS ElasticSearch Service automated snapshots/backups?
You can't get to the S3 bucket itself but you can restore from the backup stored inside it by using CURL or another HTTP client to communicate directly with your cluster telling it to rebuild from the "cs-automated" repository which is linked to the s3 snapshots. To be able to communicate with your ES cluster directly via HTTP you'll have to temporarily open an IP access policy to your cluster.