Filebeat-Logstash back pressure without persistent queues

If Logstash persistent queues are disabled, is there back pressure between Logstash and Filebeat?

In that case a small in-memory queue will be used and once this fills up back-pressure will be applied.

like @Christian_Dahlqvist said, Filebeat or any beats have a small memory queue, but you could use the spool to disk option. So when back pressure happens Filebeat will persist them to disk.

Thanks guys!

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