Functional Test Server - HA deployment of Kibana

[kobelb]

It's incredibly common for us to recommend that users deploy multiple instances of Kibana behind a load-balancer. This allows users to get more throughput out of Kibana, and not experience downtime if a single instance crashes. As such, it's important that we're confident that Kibana behaves properly in this configuration.

Currently, the functional test server runs a single instance of Kibana that isn't behind a load balancer. It'd be incredibly helpful to be able to run all functional tests against a HA deployment of Kibana run by the functional test server.

There are currently some Cloud tests that run against a HA deployment of Kibana; however, these tests are run very infrequently and are a subset of the total functional test.

[elasticmachine]

Pinging @elastic/kibana-operations (Team:Operations)