private static Path barrierPath(ApplicationId applicationId) {
        return TenantRepository.getBarriersPath().append(applicationId.tenant().value())
                .append("delete-application")
                .append(applicationId.serializedForm());
    }
Given baseIdSegment search/ and id search/container/default.0, return search/container
@return id segment with one extra level from the id appended
configserver/src/main/java/com/yahoo/vespa/config/server/application/TenantApplications.java