New Feature: Support for DocumentDB Change Feed triggers

Sounds like a perfect candidate for Azure Functions:

"A common design pattern in these applications is to track changes made to DocumentDB data, and update materialized views, perform real-time analytics, archive data to cold storage, and trigger notifications on certain events based on these changes. DocumentDB's Change Feed support allows you to build efficient and scalable solutions for each of these patterns."
https://docs.microsoft.com/en-us/azure/documentdb/documentdb-change-feed

User Voice link: https://feedback.azure.com/forums/355860-azure-functions/suggestions/18499330-new-feature-support-for-documentdb-change-feed-tr

The issue names no source files, tests, or entry points. Start by reviewing the linked DocumentDB Change Feed documentation and User Voice request, then clarify with maintainers which Azure Functions host integration is required and what tests or supported trigger behavior will define completion.

Written by the indexing model from the issue text.