Rancher logging - fluentd buffer configuration


We have Rancher v2.3.5 and want to send cluster/project logs to elasticsearch 7.3.0 cluster.

We want to modify fluentd buffer parameters, either to limit the buffer size or use different buffer folder.

When trying to add section in Rancher → project → logging → Edit as File, we get error:
“unexpected configure element: expected 1 configure element buffer, but got 2”

Is there a way to touch fluentd buffer configuration from Rancher Logging?

Thanks and Best Regards,