[{"_id":"event1","pricingDict":{"usd":0},"eventManagers":{"dnewh2134":{"role":"Admin"},"jisjdf2":{"role":"Organizer"}}},{"_id":"event2","pricingDict":{"usd":25},"eventManagers":{"jisjdf2":{"role":"Organizer"}}},{"_id":"event3","pricingDict":{"usd":25,"aud":32},"eventManagers":{"dnewh2134":{"role":"Admin"},"jisjdf2":{"role":"Organizer"}}}]

db.collection.aggregate([{"$match":{$expr:{$ne:[{"$filter":{"input":{"$objectToArray":"$eventManagers"},"as":"em","cond":{$eq:["$$em.v.role","Admin"]}}},[]]}}}])