apps/elk-stack is long out of date

[buzzware]

Please update to ES 6.2.x

The latest images have only just been published here : https://hub.docker.com/r/elastic/

My attempt at doing so : https://github.com/buzzware/elk, but it fails when I try to access it

Here are some useful links :

https://github.com/deviantony/docker-elk/tree/searchguard Searchguard gives login security for free. Plain ES has no security, and X Pack Security costs an unknown amount
https://github.com/spujadas/elk-docker 6.2.3
https://github.com/deviantony/docker-elk 6.2.2