Description

When trying to create a new export request, if the "filters" or "format" keys are missing, the source is skipped and the resource request is not sent to the applications. The problem is that those applications are not notified about it, so they might think that the event is actually not reaching the application.

Steps to reproduce

1. Start the api server.
2. Modify the "example_export_request.json" file and remove the "filters" key completely.

Expected behavior

Return a 400 response to signal the caller that the required "filters" and "format" keys were missing.