[ADD] clouder_template_elasticsearch: Provide Elastic

[lasley]

This provides a base Elasticsearch 5.0 template.

The config file is pretty blank, but we can hit that in another ticket after I finish tuning it on my dev install.

Regarding the backups - we have to use another tool called Elasticdump. It's best to run that in a container of its own though, so I just added to the readme.

Did I miss anything else? I feel like I missed something.

[codecov-io]

Current coverage is 31.01% (diff: 37.03%)

Merging #179 into master will increase coverage by 0.02%

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[lasley]

@YannickB Alright this is good for a second review and possible merge.

I have another ticket open to add SSL between Elastic and the Proxy. That's dependent on the CA #180 though, so best to just leave as a task IMO.

Did I need to add any proxy configs, or are those all automatic assuming the use of the http tag on the port?

[YannickB]

OK LGTM.

The proxy will automatically use the http tag, so no configuration needed here.