Wrong default for registry_path

[gnobironts]

Impacted version

4.11.0

Description

On previous versions, the effective registry path for Ubuntu was /var/lib/filebeat/registry (path.data: /var/lib/filebeat and a relative filebeat.registry.path : registry)

When using the latest 4.11.0 version of this module, filebeat.registry.path is set to /var/lib/filebeat which makes filebeat send en second time all the logs.

Maybe it would be better to keep filebeat's default value and give registry_path an undef value ?