Who is going to access the cluster? What is the use case?
This guide shows how to secure Elasticsearch using the commercial security features. If you have a small use-case, the easiest way to get access to this is by using our hosted Elasticsearch Service.
You can also enable a password for the HTTP protocol by making Elasticsearch bind to the loopback interface and introduce a reverse proxy to handle authentication. It is however usually hard to handle anything but authentication this way.
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