Mongo.UnorderedBulk.write

You're seeing just the function write, go back to Mongo.UnorderedBulk module for more information.
Link to this function

write(enum, top, coll, limit \\ 1000, opts \\ [])

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Specs

Returns a stream chunk function that can be used with streams. The limit specifies the number of operation hold in the memory while processing the stream inputs.

The inputs of the stream should be Mongo.BulkOps.bulk_op. See Mongo.BulkOps