SDK: extraction pipeline update method is not working as expected

I’m trying to use Update extraction pipelines method to update my extraction pipelines created. Here are some issues i face:

1. I’m unable to update contacts for an extraction pipeline, it throws the below error:
code - 

contact_info = [ExtractionPipelineContact(name="sangs", email="sm6@slb.com", role = "MAINTAINER", send_notification=True)]
to_update = ExtractionPipelineUpdate(external_id="<PIPELINE-EXT-ID-2>")
to_update.contacts.set(contact_info)
client.extraction_pipelines.update(to_update)

error - 

“CogniteAPIError: Unexpected field - items[0].update.contacts.set[0].send_notification - did you mean sendNotification? | code: 400 | X-Request-ID: 918d1113-6a5e-9d38-b850-61e3dc54c220 The API Failed to process some items. Successful (2xx): [] Unknown (5xx): [] Failed (4xx): [<PIPELINE-EXT-ID-2>, ...]”

2. I’m unable to set the specified fields to None using sdk : description, source, schedule,documentation, name and dataset-id. Im able to set only metadata and raw-tables to None. Wondering why some are supported and some arent. is this the expected behaviour? below is the error i face when i make specified fields to None:
code- 

to_update = ExtractionPipelineUpdate(external_id="<PIPELINE-EXT-ID-2>")
to_update.documentation.set(None)
client.extraction_pipelines.update(to_update)

error - 
“CogniteAPIError: Unexpected field - items[0].update.documentation.setNull - did you mean set? | code: 400 | X-Request-ID: 40485149-0d37-9f02-bed5-7d9dc32192d3 The API Failed to process some items. Successful (2xx): [] Unknown (5xx): [] Failed (4xx): [<PIPELINE-EXT-ID-2>, ...]”

3. i see “notificationConfig” is not supported in sdk yet. When can we expect it’s support?