code: public static PropertyNotUniqueException cannotCreateProperty(Concept concept, Schema.VertexProperty property, Object value){
          return create(UNIQUE_PROPERTY_TAKEN.getMessage(property.name(), value, concept));
      }
docs: Thrown when trying to create a {@link SchemaConcept} using a unique property which is already taken.
  For example this happens when using an already taken {@link Label}