Setting limits for the type of AWS ElasticSearch instances will help you address internal compliance requirements and prevent unexpected charges on your AWS bill. Ensure that your existing AWS instances and dedicated master have the desired type established by your organization based on the caching workload required.

It is an AWS best practice to remove all unused EC2 key pairs from your account. It provides security to your EC2 machines by restricting access to individuals who are no longer part of your organization but still have old key value pairs with them.