@Override
    public long deleteAll() {
        val query = new Query(Criteria.where(MongoDbTicketDocument.FIELD_NAME_ID).exists(true));
        return ticketCatalog.findAll()
            .stream()
            .map(this::getTicketCollectionInstanceByMetadata)
            .filter(StringUtils::isNotBlank)
            .mapToLong(collectionName -> {
                val countTickets = mongoTemplate.count(query, collectionName);
                mongoTemplate.remove(query, collectionName);
                return countTickets;
            })
            .sum();
    }
Calculate the time at which the ticket is eligible for automated deletion by MongoDb.
Makes the assumption that the CAS server date and the Mongo server date are in sync.
support/cas-server-support-mongo-ticket-registry/src/main/java/org/apereo/cas/ticket/registry/MongoDbTicketRegistry.java