Logstash Security and Performance

I am going to setup ELK on production. So that I have to change to ssl and basic authentication. I upgrade to 5.x, looks greate. With X-Pack, security becomes so easy! Greate job!

With x-pack, I have to set roles uses. And for logstash, I followed below link.
But I am a little concern about the performance. While logstash -> Elasticsearch is an high frequecy transaction and I only need to ensure the security between brower and kibana. The security of communications between logstash, elasticsearch and kibana can be handled by network.

Is there a better sollution? Will it is better if I enable Enabling Anonymous Access (https://www.elastic.co/guide/en/x-pack/current/anonymous-access.html) ?

Have you tested performance?

Not yet!
Can I only enable security on kibana so that logstash can push data into elasticsearch without authentication?

You can setup anonymous access, yes.

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