how to use $lookup in mongodb change stream?

Question

based on docs in mongoDB Change Stream Docs i can use only these operations for getting output of change stream:

• $addFields
• $match
• $project
• $replaceRoot
• $replaceWith (Available starting in MongoDB 4.2)
• $redact
• $set (Available starting in MongoDB 4.2)
• $unset (Available starting in MongoDB 4.2)

but I want to use $lookup op :(

Do you have any idea to achieve this?

Answer 1

The allowed operations are transformations on the change stream-produced documents. You are asking about joining other collections.

If you want to join other collections, you need to issue those queries separately from the change stream.