ES basic questions

I have some basic questions. Also if someone could point me to right sources it would be very helpful.

How many instances of Elasticsearch are we allowed to have on the same server?
Can we have multiple Kibana instances on the same server?

The "normal" way of deploying is to use one node per server. You can run more that one node on a server but it is fairly advanced.

what do you mean by normal? What if I am going to have terabytes of documents or have more than 20 applications running? Will 1 node do the job if the traffic grows?

By "normal" I mean "common". One node won't scale indefinitely and in that case it is normal to have more than one server running one elasticsearch process each.


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