public Builder addContactPoint(final String address) {
            try {
                this.addresses.add(InetAddress.getByName(address));
                return this;
            } catch (UnknownHostException e) {
                throw new IllegalArgumentException(e.getMessage());
            }
        }
Adds the address of a Gremlin Server to the list of servers a {@link Client} will try to contact to send
requests to.  The address should be parseable by {@link InetAddress#getByName(String)}.  That's the only
validation performed at this point.  No connection to the host is attempted.
gremlin-driver/src/main/java/org/apache/tinkerpop/gremlin/driver/Cluster.java