Is that node up and running, can you ping/telnet from the current node that is part of the cluster?
It looks like a networking issue stopped it from seeing the other node, so I'd try restarting the node-1d56ac14-2323-411d-b543-462408c202b3 node and see if it joins the other one.
Also you have way too many shards on this cluster. You really need to reduce the count of these are you will be wasting a lot of resources.