NiFi cannot connect to docker / fails to put record with timeout exception

docker-compose.yml

version: "3"
services:
  zookeeper:  # the configuration manager
      hostname: zookeeper
      container_name: zookeeper
      image: 'bitnami/zookeeper:3.6.1'
      environment:
        - ALLOW_ANONYMOUS_LOGIN=yes
  nifi:
    image: apache/nifi:1.11.4
    ports:
      - 8080:8080 # Unsecured HTTP Web Port
    environment:
      - NIFI_WEB_HTTP_PORT=8080
      - NIFI_CLUSTER_IS_NODE=true
      - NIFI_CLUSTER_NODE_PROTOCOL_PORT=8082
      - NIFI_ZK_CONNECT_STRING=zookeeper:2181
      - NIFI_ELECTION_MAX_WAIT=1 min
    links:
      - broker
      
  broker:
    image: confluentinc/cp-kafka:5.5.0
    hostname: broker
    container_name: broker
    depends_on:
      - zookeeper
    ports:
      - "29092:29092"
      - "9092:9092"
    environment:
      KAFKA_BROKER_ID: 1
      KAFKA_ZOOKEEPER_CONNECT: 'zookeeper:2181'
      KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: PLAINTEXT:PLAINTEXT,PLAINTEXT_HOST:PLAINTEXT
      KAFKA_ADVERTISED_LISTENERS: PLAINTEXT://broker:29092,PLAINTEXT_HOST://localhost:9092
      KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR: 1
      KAFKA_TRANSACTION_STATE_LOG_MIN_ISR: 1
      KAFKA_TRANSACTION_STATE_LOG_REPLICATION_FACTOR: 1
      KAFKA_GROUP_INITIAL_REBALANCE_DELAY_MS: 0

https://apachenifi.slack.com/archives/C0L9VCD47/p1591647141161100