Como upsert com mongodb-java-driver

 void setLastIndex(MongoClient mongo, Long id, Long lastIndexValue) {

    Bson filter = Filters.eq("_id", id);

    Bson update =  new Document("$set",
                  new Document()
                        .append("lastIndex", lastIndexValue)
                        .append("created", new Date()));
    UpdateOptions options = new UpdateOptions().upsert(true);

    mongo.getDatabase(EventStreamApp.EVENTS_DB)
         .getCollection(EventCursor.name)
         .updateOne(filter, update, options);
  }