Support authentications

[galiacheng]

I would like to use the exporter to export logs to Elastic Cloud using basic auth.
It would be nice to have a way to configure authentication information.

Here has an example: https://www.elastic.co/guide/en/elasticsearch/client/java-rest/7.8/_basic_authentication.html#_basic_authentication

[mriccell]

Thanks so much for the suggestion, we will capture your enhancement requirement and prioritize it.

Monica