If you hover on it, it shows the ip and port.
so here we go, remove the 8983 one. Basically the cluster state is keeped in the Zookeeper, all we need to do is download the file and remove the dead/testing nodes, then upload it back. To do this, we need download a full version of the zookeeper , under the bin ,the is a full featured zk client zkCli which enable us to get and set the data.
So save the clusterstate.json to local file.
then upload it back,
./zkCli.sh -server 127.0.0.1:9984 set /clusterstate.json "`cat new.txt`"
then it’s gone!~