Turn on search service

[cesine]

Upgrade to 16.04 and turn on search service

Originally we tried using the default version available in apt-get
https://www.elastic.co/guide/en/elasticsearch/reference/current/deb.html

But were unable to start the service
elastic/elasticsearch#21017

So then we used https://www.elastic.co/guide/en/elasticsearch/reference/current/deb.html#deb-key

[cesine]

seach is on