Transport_address resolved as IP:PORT in docker

Hello everyone,

I am struggling with Docker and Elasticsearch. I am trying to setup my instance so it has published adddress in format HOSTNAME:PORT and not IP:PORT for both HTTP and transport. I am posting my docker-compose setting (with ES 8.0.0)

    container_name: elastic-1
    restart: unless-stopped
      - INSTANCE_NAME=elastic-1
      - cluster.initial_master_nodes=elastic-1
      - bootstrap.memory_lock=true
      - ES_SETTING_NETWORK_HOST=elastic-1
      - ES_JAVA_OPTS=-Xms512m -Xmx512m -Des.transport.cname_in_publish_address=true

Instance is running well however when I call _nodes/_all/os I get following results:

  "nodes": {
    "xjHfLp5gTo2jSEebxUhOAA": {
      "name": "elastic-1",
      "transport_address": "",
      "host": "elastic-1",
      "ip": "",
      "version": "8.0.0",
      "http": {
        "bound_address": [
        "publish_address": "elastic-1/",
        "max_content_length_in_bytes": 104857600

My question is how can I achieve "elastic-1:9300" in transport_address and publish_address? My issue is that I am trying to use Apache Spark connecting to ES and it fails since it tries to connect to node using IP address and not hostname.

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