Database
[{name:"duplicate",value:true,id:2910921},{name:"duplicate",value:true,id:32838293},{name:"duplicate",value:false,id:3283232},{name:"notDuplicate",value:true,id:382932},{name:"duplicate",value:true,id:123},{name:"duplicate",value:true,id:456}]
Query
db.collection.aggregate([{$group:{_id:{name:"$name",value:"$value"},doc:{$last:"$$ROOT"}}},{$replaceRoot:{newRoot:"$doc"}}])