Mongo.find

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

find(topology_pid, coll, filter, opts \\ [])

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Specs

find(GenServer.server(), collection(), BSON.document(), Keyword.t()) ::
  cursor() | {:error, term()}

Selects documents in a collection and returns a cursor for the selected documents.

For all options see Options

Use the underscore style, for example to set the option singleBatch use single_batch. Another example:

 Mongo.find(top, "jobs", %{}, batch_size: 2)