CODE EXAMPLE FOR PYTHON

python google docs api how to get doc index

service = build('docs', 'v1', credentials=creds)
doc_id = ''

document = service.documents().get(documentId=doc_id).execute()
body = document['body']
content = body['content']
temp = content[len(content)-1]
endIndex = temp['endIndex']

# You might need to -1 off the endIndex