I have a MongoDB replica set with 6 members. 3 members (including the primary) are using MongoDB 3.4 and remaining 3 are MongoDB 3.6 which i have added as part of upgrading.
For 2 collections documents have been replicated to new secondary (version 3.6) but when I query document count is zero . Remaining collections are replicated to secondary without any issues.
I’m not sure why document count displays zero for these two collections.https://i.stack.imgur.com/ZymaT.png