该命令是对leader进行重新负载均衡
用法：

bin/kafka-preferred-replica-election.sh --zookeeper localhost:12913/kafka --path-to-json-file topicPartitionList.json

topicPartitionList.json内容：

{
    "partitions": [
        {
            "topic": "topic",
            "partition": 0
        },
        {
            "topic": "topic",
            "partition": 1
        },
        {
            "topic": "topic",
            "partition": 2
        },
        {
            "topic": "topic",
            "partition": 3
        },
        {
            "topic": "topic",
            "partition": 4
        },
        {
            "topic": "topic",
            "partition": 5
        },
        {
            "topic": "topic",
            "partition": 6
        },
        {
            "topic": "topic",
            "partition": 7
        }
    ]
}

在Kafka中修改Topic的preferred replica