mongo

Document document = coll.find(eq("uuid",event.getPlayer().getUniqueId().toString())).first();

            if (document == null) {
                Document doc = new Document("name", event.getPlayer().getDisplayName())
                        .append("uuid", event.getPlayer().getUniqueId())
                        .append("kills", 0)
                        .append("deaths", 0)
                        .append("killstreak", 0)
                        .append(event.getPlayer().getUniqueId().toString(), null);
                coll.insertOne(doc);
            }