High Availability Search with SolrCloud by Brent Lemons.
Brent explains that using embedded ZooKeeper is useful for testing/learning SolrCloud, but high availaility requires more.
As in separate installations of SolrCloud and ZooKeeper, both as high availability applications.
He walks through the steps to create and test such an installation.
If you have or expect to have a high availability search requirement, Brent’s post will be helpful.