Can you paste the contents of your Metricbeat configuration? It doesn't seem an error of Central Management.
I think that the problem is that you don't have an output defined in your Metricbeat configuration file. Check it and ensure you have an uncommented output like:
output.elasticsearch:
# Array of hosts to connect to.
hosts: ["localhost:9200"]
# Optional protocol and basic auth credentials.
#protocol: "https"
#username: "elastic"
#password: "changeme"
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