docs: public static Specification<JpaTarget> hasNotDistributionSetInActions(final Long distributionSetId) {
          return (targetRoot, query, cb) -> {
              final ListJoin<JpaTarget, JpaAction> actionsJoin = targetRoot.join(JpaTarget_.actions, JoinType.LEFT);
              actionsJoin.on(cb.equal(actionsJoin.get(JpaAction_.distributionSet).get(JpaDistributionSet_.id),
                      distributionSetId));
  
              return cb.isNull(actionsJoin.get(JpaAction_.id));
          };
      }