OST:PORT values, followed by an optional chroot value
          that starts with a forward slash. Using a chroot allows multiple
          applications to coexist in one ensemble. For full details, see the
          Zookeeper documentation. Some examples:
          <p>
          "host1:2181"
          <p>
          "host1:2181,host2:2181,host3:2181/mysolrchroot"
          <p>
          "zoo1.example.com:2181,zoo2.example.com:2181,zoo3.example.com:2181"</dd><dd><code>httpClient</code> - the <code>HttpClient<