According to the mongodb documentation ( https://docs.mongodb.com/manual/release-notes/drivers-write-concern/ ) the default write concern for drivers is acknowledgement of write operations.
The default write concern on the new
MongoClientclass will be to acknowledge all write operations
Will the newly written document be immediately queryable even though the document might not have been written to disk?
Do any of the write concern configurations in mongodb produce eventual consistency issues that developers need to be aware of that could cause a document just inserted/updated to not be immediately noticeable?