Filebeat v6 and elasticsearch v6

[nsteinmetz (Nicolas Steinmetz)]

Seems a better option is to have a dedicated template for filebeat 6.0.0 to avoid compatibility issues between 2 différent versions.

@nsteinmetz

curl -XPUT -H 'Content-Type: application/json' http://localhost:9200/_template/filebeat-6.0.0 -d@filebeat.template-es6x.json

And then voilà