[{"id":"333","name":"cat Three name","description":"cat item description"},{"id":"222","name":"cat Two name","description":"cat item description"},{"id":"222","name":"cat Two name","description":"cat item description"},{"id":"333","name":"cat Three name","description":"cat item description"}]

db.collection.aggregate([{$addFields:{_id:"$id",id:"$$REMOVE"}},{$group:{_id:"$_id",data:{$first:"$$ROOT"}}},{$replaceRoot:{newRoot:"$data"}}])