Tuning logstash performance

Elastic Stack Logstash
1

Hi, I use logstash to connect between elasticsearch and ntopng(a flow collector).
but there are many drop flows, so I think the bottle neck is on logstash because my RAM is 20G and CPU 8 cores.
But I am not sure which parameter could I edit to tune the logstash in the logstash.yml

thank you in advance!

2

I would start here
https://www.elastic.co/guide/en/logstash/current/tuning-logstash.html

3

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