Hi @Luis_Pereira1,
The default health check is performed by invoking status API:
curl -fsSL http://localhost:9200/_cat/health?h=status
Could you please check what is the health status on your ES container?
You might need to see the logs to identify if there was something that prevents the cluster status to be green.
With no logs its difficult to identify what might be happening in your case.
Thanks and Regards,
Yogesh Gaikwad