Imposing ZooKeeper ensemble leader.

Hello,

I'm running some performance experiments which involve ZooKeeper.
In order to simplify things I'd like to point all clients to the same
server, and, most importantly, I'd like that server to be the leader of
the ensemble.

So I was wondering: is there a way to choose and impose a leader of the
ensemble (thus bypassing the leader election algorithm)..?

Thanks in advance.
Kind regards,
Paolo