Add support for Logstash 7.x

[Yggdrasil]

Please add support for Logstash 7.x to this module.

Given that the pcfens-filebeat module supports the 7.x branch now, and that Logstash version 7.0 has been release almost four months ago, it would be very nice to be able to upgrade our entire ELK pipeline to 7 to take advantage of the new features of that release.

[ninaspitfire]

Logstash 7 is actually already supported. You can just do this:

class { 'elastic_stack::repo':
  version => 7,
}

class { 'logstash':
  manage_repo => true,
}

You are absolutely right, though, that it should be the default now and should be clear in the documentation.

This PR should have been merged a long time ago, and I can only apologize for the fact that it wasn't.

[ninaspitfire]

Fixed in voxpupuli/puppet-elastic_stack#26.