[{_id:"649d0bae47fa0b4db69f2cf6"},{_id:"649d0bae47fa0b4db69f2cf9"}]

db.collection.find({_id:{$in:["649d0bae47fa0b4db69f2cf6","649d0bae47fa0b4db69f2cf7","649d0bae47fa0b4db69f2cf8"]}})