Filebeat output logtsah protocol?

Elastic Stack Beats
1

Hi,
Its known thing that filebeat doesn't use http protocol when it uses logstash as an output plugin.
Then what protocol does it use? Is it lumberjack only?

br,
Sunil

2

From what I gather the Beats protocol is an evolution of the Lumberjack protocol.

3

From what I gather the Beats protocol is an evolution of the Lumberjack protocol.

Right. It's still lumberjack, but v2.