[{name:"1",collaborators:[{"domain":"xyz.com"},{"buName":"Vignesh B"},{"domain":"yz.com"},{"domain":"xyz.com","buName":"Vignesh B"}]},{name:"2",collaborators:[{"domain":"xyz.com","buName":"Vignesh BU"}]},{name:"3",collaborators:[{"domain":"yz.com"}]},{name:"4",collaborators:[{"buName":"Vignesh BU"},{"domain":"xyz.com"},{"domain":"xyz.com","buName":"Vignesh BU"}]}]

db.collection.find({$or:[{"collaborators":{$elemMatch:{"domain":"xyz.com","buName":{"$exists":false}}}},{"collaborators":{$elemMatch:{"buName":"Vignesh BU","domain":{"$exists":false}}}},{"collaborators":{$elemMatch:{"buName":"Vignesh BU","domain":"xyz.com"}}}]})