public SparkGraphComputer kryoRegistrationRequired(final boolean required) {
        return configure(SPARK_KRYO_REGISTRATION_REQUIRED, required);
    }
Determines if kryo registration is required such that attempts to serialize classes that are not registered
will result in an error. By default this value is {@code false}.
spark-gremlin/src/main/java/org/apache/tinkerpop/gremlin/spark/process/computer/SparkGraphComputer.java