public Builder validationRequest(final String script) {
            validationRequest = script;
            return this;
        }
Specify a valid Gremlin script that can be used to test remote operations. This script should be designed
to return quickly with the least amount of overhead possible. By default, the script sends an empty string.
If the graph does not support that sort of script because it requires all scripts to include a reference
to a graph then a good option might be {@code g.inject()}.
gremlin-driver/src/main/java/org/apache/tinkerpop/gremlin/driver/Cluster.java