public static ProductiveByStrategy instance() {
        return INSTANCE;
    }
Gets the standard configuration of this strategy that will apply it for all conditions. It is this version of
the strategy that is added as standard. Note that it may be helpful to configure a custom instance using the
{@link #build()} method in cases where there is certainty that a {@code by()} will be productive as it will
reduce the complexity of the traversal and perhaps improve the execution of other optimizations.
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/strategy/optimization/ProductiveByStrategy.java