db={"groups":[{"_id":"0485d959-36c2-463e-b2d9-e73f28aa00ff","name":"group1","roles":[{"_id":"33aec88e-f809-4b4c-9a55-85d445edeba8","name":"Test4 Role",},{"_id":"3ccc216e-81cb-4735-9dd9-6d65dc5b7176","name":"one permission",},{"_id":"f8891526-4f79-4d20-8755-f2bfdbbd6516","name":"I am a Role, with one permission",}],"createdOn":{"$date":"2022-08-09T21:44:28.200Z"},"createdBy":"a@abc.com","updatedOn":{"$date":"2022-08-18T20:31:06.474Z"},"updatedBy":null,"count":0}]}

db.groups.update({"_id":"0485d959-36c2-463e-b2d9-e73f28aa00ff","$or":[{"roles":{"$elemMatch":{"_id":{"$ne":"33aec88e-f809-4b4c-9a55-85d445edeba8"}}}},{"roles":null},{"$nor":[{"roles":{"$ne":null,"$not":{"$size":0}}}]}]},{"$push":{"roles":{"_id":"33aec88e-f809-4b4c-9a55-85d445edeba8","name":"Test4 Role"}}})