support PKI authentication for the ES integration (TLS, mutual TLS, mutual SSL)

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Problem to solve

Allow users to use ES clusters with TLS authentication enabled for indexing

Intended users

Further details

PKI authentication is part of xpack, see:

• https://www.elastic.co/guide/en/elastic-stack-overview/6.5/pki-realm.html
• https://www.elastic.co/blog/elasticsearch-security-configure-tls-ssl-pki-authentication

Proposal

We currently only support basic auth, we should extend it to support TLS authentication

Permissions and Security

Documentation

Testing

What does success look like, and how can we measure that?

What is the type of buyer?

Links / references