About New ELK load balance architecture?

Dear Folks,

Now we want to try this new version of ELK stack(5.1) for metrics collecting, but I have some doubts about balance architecture.

architecture 1:

Metricbeat->Logstash cluster(logstash1,logstash2,logstash3)->elastic cluster(elastic-1,elastic-2,elastic-3)

architecture 2:

Metricbeat->Redis cluster(Redis1,Redis2,Redis3)->Logstash cluster(logstash1,logstash2,logstash3)->elastic cluster(elastic-1,elastic-2,elastic-3)

My concern is that Does Metricbeat can directly sent metrics to logstash cluster or we need put a proxy before logstash cluster? How Kibana connect to elastic cluster?

which one is better ? Is there a use cases with high available and load balance for this new ELK architecture?

Thanks in advance

Any suggestions for this?

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