How to watch for changes to specific fields in MongoDB change stream

Question

I am using the node driver for mongodb to initiate a change stream on a document that has lots of fields that update continuously (via some logic on the insert/update end that c

Answer 1

I'm looking for something similar, but from the blog post at https://www.mongodb.com/blog/post/an-introduction-to-change-streams, it looks like you might need to change your filter to:

var filter = {
    $match: {
        $and: [
            { "updateDescription.updatedFields.SomeFieldA": { $exists: true } },
            { operationType: 'update'}
        ]
    }
};