ndi.cloud.api.documents.get_bulk_download_url
get_bulk_download_url - Get URL for downloading documents in bulk
downloadUrl = get_bulk_download_url(dataset_id) returns a signed url to
download a zip file containing one or more json files containing document
data (as a root-level array) for the specified dataset
Inputs:
dataset_id - string representing a dataset id
Outputs:
downloadUrl - string representing a download url