Elatricsearch (you may need to run securityadmin)Issue

Hello everyone,
After setup the Elasticsearch and Kibana (version 7.2.0), I can get access to the Kibana but not Elasticsearch. It gives me the following error:
[ERROR][c.a.o.s.a.BackendRegistry] [odfe-node1] Not yet initialized (you may need to run securityadmin)

And from the UI the error is: 502 Bad Gateway.

Can anyone help please?

Thanks