docs: public static Specification<JpaTarget> byControllerIdWithAssignedDsInJoin(final Collection<String> controllerIDs) {
          return (targetRoot, query, cb) -> {
  
              final Predicate predicate = targetRoot.get(JpaTarget_.controllerId).in(controllerIDs);
              targetRoot.fetch(JpaTarget_.assignedDistributionSet);
              return predicate;
          };
      }