Not able to login to server via ssh. I have started the elastic search service and after that I am not able to login to server

After initiating the Elasticsearch service on Google Cloud's Compute Engine with NGINX, I encountered difficulties accessing SSH.

In the elasticsearch I have done :

1. network.host: localhost
2. sudo ufw allow from 198.51.100.0 to any port 9200
3. sudo ufw enable

Also firewall for port 22 also enabled but still not able to login