Error code: 72004 - Ingress cannot identify channel, no _ablyChannel field

This error occurs because the change event, after being processed through the MongoDB Change Stream pipeline, does not contain the _ablyChannel field. This field is necessary as it identifies the channel where the change event message will be published.

Solving this error:

Ensure that the _ablyChannel field is present at the root level of the change event. Avoid nesting it in sections like "$fullDocument._ablyChannel". The field must be in the main structure of the change event for proper identification.

 If you still require help, reach out to the support team and we will be happy to assist.