public void rename(final Object oldKey, final Object newKey) {
        this.parameters.put(newKey, this.parameters.remove(oldKey));
    }
Renames a key in the parameter set.

@param oldKey the key to rename
@param newKey the new name of the key
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/util/Parameters.java