What is the difference between setting or not cluster-name in elasticsearch output?

Elastic Stack Elasticsearch
1

Hello,
I have logstash flushing in an elasticsearch cluster named "mycluster", so
I configured output "elasticsearch" as follows:

elasticsearch.yml:
cluster.name: mycluster
...

logstash.conf
output {
elasticsearch {
host => "10.10.10.10"

cluster => "mycluster"

protocol => "http"
}

}

Here I found that specifying the name of the cluster in logstash.conf is
optional
http://logstash.net/docs/1.4.2/outputs/elasticsearch#cluster

I made a test commenting cluster name in logstash.conf and everything seems
working properly

I would like to know:

  1. what would be logstash behaviour in case more than one cluster exists on
    same server?
  2. what is the difference between specifying or not cluster name in
    logstash.conf?
  3. in general do we have some benefits specifying cluster name even if its
    not required?

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