我在docker容器中使用本教程创建了kafka集群。当我跑的时候 kafkacat -L -b kafka-1:19092 我得到：

Metadata for all topics (from broker 1: kafka-1:19092/1):
 3 brokers:
  broker 2 at kafka-2:29092
  broker 3 at kafka-3:39092
  broker 1 at kafka-1:19092
 1 topics:
  topic "__confluent.support.metrics" with 1 partitions:
    partition 0, leader 2, replicas: 2,3, isrs: 2,3

我怎样才能找到首席经纪人？我想杀死它，并看到集群的行为后，选择新的领导。