default Optional<? extends Column> findColumn(Project project) {
        return DocumentDbUtil.referencedColumnIfPresent(project, identifier());
    }
Locates the column that this field is referencing by using the specified
{@link Project} instance.

@param project  the project instance
@return         the column
runtime-parent/runtime-field/src/main/java/com/speedment/runtime/field/trait/HasIdentifier.java