Make ES accessible via webinterface

[kidclamp]

netstat -antp | grep 9200
(Not all processes could be identified, non-owned process info
will not be shown, you would have to be root to see it all.)
tcp6 0 0 127.0.0.1:9200 :::* LISTEN -
tcp6 0 0 ::1:9200 :::* LISTEN -

[tomascohen]

Maybe we need to add a couple configuration entries:

https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-network.html#_ipv4_vs_ipv6

I'm currently working on other stuff and cannot recreate the box with elastic on this computer.