Remove the port from the cluster.initial_master_nodes setting, and it will work 
We have updated the docs recently to make it clearer that either node name, or ip/port is to be used. Node name/port is not a valid combination.
Remove the port from the cluster.initial_master_nodes setting, and it will work We have updated the docs recently to make it clearer that either node name, or ip/port is to be used. Node name/port is not a valid combination.
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