this seems to be a different problem then.
Do you mind sharing the following entries from your mongodb?
echo 'db.scheduler_job_definitions.find()' | mongo graylog
echo 'db.scheduler_triggers.find()' | mongo graylog
echo 'db.event_notifications.find()' | mongo graylog
echo 'db.event_definitions.find()' | mongo graylog
echo 'db.event_processor_state.find()' | mongo graylog
echo 'db.scheduler_triggers.find()' | mongo graylog
echo 'db.processing_status.find()' | mongo graylog
Thanks 