docs: @DeleteOperation
      public void invalidate(@Nullable final String serviceId) {
          if (StringUtils.isBlank(serviceId)) {
              cachingMetadataResolver.invalidate();
          } else {
              val registeredService = findRegisteredService(serviceId);
              val criteriaSet = new CriteriaSet();
              criteriaSet.add(new EntityIdCriterion(serviceId));
              criteriaSet.add(new EntityRoleCriterion(SPSSODescriptor.DEFAULT_ELEMENT_NAME));
              cachingMetadataResolver.invalidate(registeredService, criteriaSet);
          }
      }