Specify leader when doing partition reassignment

[tao xiao]

Hi team,

Is it possible to specify a leader broker for each topic partition when
doing partition reassignment?

For example I have following json. Is the first broker in the replicas list
by default the leader of the partition e.g. broker 3 is the leader of topic
test5 and broker 2 is the leader of topic test3. or does Kafka
automatically pick the leader based on the leadership ratio
if auto.leader.rebalance.enable is on

{
  "version": 1,
  "partitions": [
    {
      "topic": "test5",
      "partition": 0,
      "replicas": [3, 1]
    },
    {
      "topic": "test3",
      "partition": 0,
      "replicas": [2,3]
    },
    {
      "topic": "test1",
      "partition": 0,
      "replicas": [1,2]
    }
  ]
}