You are failing on bootstrap checks:
[2019-03-15T01:56:48,246][ERROR][o.e.b.Bootstrap ] [node-1] node validation exception
[1] bootstrap checks failed
[1]: the default discovery settings are unsuitable for production use; at least one of [discovery.seed_hosts, discovery.seed_providers, cluster.initial_master_nodes] must be configured
The cluster coordination algorithm has changed in 7.0 and in order to be safe it requires some specific configuration. We relax that requirement (that is, we run in a less-safe mode) when you bind to localhost only, but if/when you change network.host we enforce that your configure the cluster safely.
This is covered in the breaking changes documentation for 7.0