How to setup watcher email alerts in cluster level kibana

previous i created the watcher in my local server 1 elasticsearch and kibana server.

now my requirement is my cluster having 3 es nodes ,2 logstash nodes ,3 ml nodes,1 kibana .. how to setup watcher and email conf in elasticsearch.yml ?

  1. shall i conf email all 3 es nodes ?
  2. how to configure watcher and which node i need to configure ?
    3.which mandatory settings are enable in elasticsearch.yml, kibana.yml & logstash.yml

thanks in advance .

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