I've been working on a go library for solr that is zk aware for the past few months. Here is my library. let me know if you'd like to contribute. I compute the hashrange given a key and route and return the desired servers in the cluster then have an sdk for query and for retries given network outages. We've found that just using a load balancer leads to some data loss when nodes reboot which is why i emulated the java solr client and rotate through a list of solr servers.
https://github.com/sendgrid/go-solr
