Elasticsearch and logstash inside docker - connection refused

[nxns1]

Hello, I have a logstash image on a docker container, and elasticsearch on a different host (xx.xx.xx.xx). My config files look like this:

• docker-compose.yml

    version: '3.7'
    services:
       logstash:
          image: logstash:1.0
          ports:
             - "5044:5044"
          command: logstash -f /config-dir/logstash.conf
          volumes:
             - "/docker/logstash:/config-dir:ro"
          environment:
             - XPACK_MONITORING_ENABLED=false
  

• logstash.conf

    input {
      beats {
        port => 5044
      }
    }
    output {
      elasticsearch {
        hosts => ["xx.xx.xx.xx:9200"]
      }
    }
  

On elasticsearch.yml, everything is commented out.

I'm getting the following error on Logstash:

[2019-09-30T23:13:30,269][WARN ][logstash.outputs.elasticsearch] Attempted to resurrect connection to dead ES instance, but got an error. {:url=>"http://xx.xx.xx.xx:9200/", :error_type=>LogStash::Outputs::ElasticSearch::HttpClient::Pool::HostUnreachableError, :error=>"Elasticsearch Unreachable: [http://xx.xx.xx.xx:9200/][Manticore::SocketException] Connection refused (Connection refused)"}

Not sure what the problem is. Do I need to add network.host on elasticsearch.yml, or if this setup is enough? Also, not sure if port binding is needed since logstash is in docker?