Docker Compose service configuration command not working as intended

Question

So I'm trying to make my Docker Spring Boot container wait until my Kafka container has finished created the topics for it to stream events across.

What I have tried so far is:

• checking to see if the Kafka container has been created, this doesn't work because I'm want to wait until the topic has been created
• Used the depends_on service configuration, but again, this waits until the service has just began to run, but I need to wait until the Kafka container has created it's topic(s).
• Attempted to sleep for 10 seconds before the container runs, I believe this could be a solution to this problem, albeit 'hacky'. But I have failed to see the 10 sleep actually occur, this makes me believe that I am doing something wrong in the docker-compose.yml

Below you can find my docker-compose.yml:

version: '2'
services:
  zookeeper:
    image: wurstmeister/zookeeper
    ports:
      - "2181:2181"
  kafka:
    image: wurstmeister/kafka:0.10.2.0
    ports:
      - "9092:9092"
    expose:
      - "9092"
      - "2181"
    environment:
      KAFKA_ADVERTISED_HOST_NAME: localhost
      KAFKA_CREATE_TOPICS: "flight-events:1:1"
      KAFKA_ZOOKEEPER_CONNECT: zookeeper:2181
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
    depends_on:
      - zookeeper
  redis:
    image: redis
    ports:
      - "6379"
    restart: always
  kafka-websocket-connector:
    command: sh -c sleep 10 
    build: ./kafka-websocket-connector
    image: andrewterra/kafka-websocket-connector
    ports:
      - "8077:8077"
    depends_on:
      - kafka
      - redis
      - zookeeper
    links:
      - kafka
      - redis

I have tried multiple different values under the command service configuration, these include:

• ["sh", "-c", "sleep", "10"]
• ["sleep", "10"]
• sleep 10

Does anyone have any solutions to this problem that I am having?