Why are insertMany() calls equivalent to calls to bulkWrite() in java-sync-driver 4.11.1

Working with Data Drivers
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I’m going through the API reference for Mongocollection from the Java sync driver 4.11.1. I’ve noticed that in the definition of all the insertMany method variations, there’s this line

A call to this method is equivalent to a call to the bulkWrite method

So I wanted to understand why this is so? A googled a bit and the surface level answer seems to be that’s it’s more efficient. I wanted to understand a bit more in detail why bulkwrite() is being used here.

Thanks.

Link to API ref- MongoCollection (driver-sync 4.11.1 API)

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If bulkWrite function supports all the semantics of “insertMany” with all insert options, then why not?

Nobody wants to write duplicated code.

Unless insertMany has some special things and/or can be implemented in a more performant way.

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