Updated ELK config files to elk 7.x reference samples, bringing over
existing customisation from elk_metrics_6x.
Removed deprecated use of --pipeline in elastic_beat_setup/tasks/main.yml,
--pipeline is no longer a valid cli argument.
Updated logstash-pipelines and removed the dynamic insertion of the date into
index names. This function is now done with the new ILM feature in elasticsearch
rather than logstash.
Installation of each beat creates an ILM policy for that beat and this patch
does not change the default policy. It is possible that the default policy
will exhaust the available storage and future work needs to be done to address
this.
The non-beat elements of the logstash pipeline (syslog, collectd and others)
are not yet updated to be compatible with ILM.
Change-Id: I735b64c2b7b93e23562f35266134a176a00af1b7
68664a9dc1