ELK stack in docker

Can you curl the Elasticsearch endpoint from inside the logstash container? or from your host?

From inside container try this (using what you are using will probably fail)

curl -v http://<elasticsearch>:9200

Or try this... (probably will work)

curl -v http://host.docker.internal:9200

From outside container

curl -v http://localhost:9200

Do you know how docker networks ... how to get one container to connect to another