I see that mongo has bulk insert, but I see nowhere the capability to do bulk inserts across multiple collections. Since I do not see it anywhere I'm assuming its not available from Mongo. Any specific reason for that?
Mongo Bulk Insert across multiple collections
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You are correct in that the bulk API operates on single collections only.
There is no specific reason but the APIs in general are collection-scoped so a "cross-collection bulk insert" would be a design deviation.
You can of course set up multiple bulk API objects in a program, each on a different collection.
Update Nov 2019
As of version 4.2 (Aug 2019), all such operations can be performed in a transaction context (startTrans-commit-rollback) if necessary.