Implement full list of authentication methods for Elasticsearch plugin

[villesau]

Is your feature request related to a problem? Please describe.
In order to use ES plugin in production, authentication is required. Elasticsearch client supports few different authentication methods: https://www.elastic.co/guide/en/elasticsearch/client/javascript-api/current/auth-reference.html

Describe the solution you'd like
Would be good if all of the authentication methods would be supported. For me, especially cloud auth would be important.