rebalance brokers

Hi, All

We have some old kafka nodes that are still running 0.7.

We disable the replica of topics there. Recently we added some node brokers
to that cluster, I found new nodes won't got written or read even though
it's registered correctly in zookeeper.

I think in this case, it's because all these nodes became followers of
partitions. I need to rebalance leadership of partitions across all brokers.

If my thought is correct, how shall I rebalance leadership ?

Thanks!

Guangle