code: public static String getOpenEngSBModelIdProperty(Class<?> modelClass) {
          Field field = getOpenEngSBModelIdField(modelClass);
  
          return (field == null) ? null : field.getName();
      }
docs: Uses {@link #getAnnotatedFields(Class, Class)} to look for a field annotated with the {@code OpenEngSBModelId}
  annotation, and if present, returns its name.
  
  @param modelClass the class to introspect
  @return the name of the {@link java.lang.reflect.Field} annotated with {@code OpenEngSBModelId}, or null