Mongo.BulkOps.get_update_many

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

get_update_many(filter, update, opts \\ [])

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Specs

get_update_many(BSON.document(), BSON.document(), Keyword.t()) :: bulk_op()

Returns an update_many operation for appending to a bulk. Used to perform stream bulk writes.

Example

Mongo.BulkOps.get_update_many(%{name: "Waldo"}, %{"$set" : %{name: "Greta", kind: "dog"}})

{:update,
  {%{name: "Waldo"}, %{"$set": %{kind: "dog", name: "Greta"}}, [multi: true]}}