public Traversal.Admin<S, Map> getOnCreateTraversal() {
        return onCreateTraversal;
    }
Gets the traversal that will be used to provide the {@code Map} that will be used to create elements that
do not match the search criteria of {@link #getMergeTraversal()}.
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/map/MergeElementStep.java