Cannot use Python MongoDB connector with Atlas MongoDB

Cannot use the Python MongoDB connector with a managed Atlas instance. The current implementations makes use of splitVector which is a high-privilege function that cannot be assigned to any user in Atlas. Getting error:

pymongo.errors.OperationFailure: not authorized on properties to execute command
 { splitVector: "properties.properties", keyPattern: { _id: 1 },
...

BEAM-4567 addressed the same issue in Java connector.

Proposed solution for Python is to add bucket_auto option for the connector which would configure it to use @bucketAuto MongoDB aggregation instead of splitVector command:

pipeline | ReadFromMongoDB(uri='mongodb+srv://user:pwd@cluster0.mongodb.net',
                           db='testdb',
                           coll='input',
                           bucket_auto=True)