Elasticsearch and MongoDB with nodejs

Question

While implementing elasticsearch with mongodb and nodejs, I am using mongoosastic and elmongo module. These are working very well. But I just want to find out what is the advantage of using mongo-river plugin over node modules. And Is it necessary to use replica set when using river?

Thanks in advance

Answer 1

Use mongo-connector instead. you can learn more about mongo-connector in my blog. here is the link

Answer 2

River doesn't update in realtime, it reads oplogs from mongodb, and this can delay updates. The oplog has a finite capacity as a capped collection and when its full it works like a circular queue, replacing the oldest entries with new entries.