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the id isn't included in at least two cases where it probably should for consistency

if the _id wasn't generated server-side:
> db.foo.update({_id:'asdf'}, {$set: {a:'123'}}, true)
> db.getLastErrorObj()

{ "err" : null, "updatedExisting" : false, "n" : 1, "ok" : true }

> db.foo.update(

{a:'asdf'}

, {_id: 'qwer'}, true)
> db.getLastErrorObj()

{ "err" : null, "updatedExisting" : false, "n" : 1, "ok" : true }

if the object already existed:

> db.foo.update({_id:{$gt: ObjectId("4c2e342e38535540224f7945")}}, {$set: {a:'123'}}, true)
> db.getLastErrorObj()

{ "err" : null, "updatedExisting" : false, "upserted" : ObjectId("4c2e346538535540224f7946"), "n" : 1, "ok" : true }

> db.foo.update({_id:{$gt: ObjectId("4c2e342e38535540224f7945")}}, {$set: {a:'123'}}, true)
> db.getLastErrorObj()

{ "err" : null, "updatedExisting" : true, "n" : 1, "ok" : true }

is depended on by

SERVER-2625 Mongo throws uncaught exception while perfoming findAndModify trying to return newly created document

is related to

SERVER-13865 Shell returns incorrect WriteResult for compatibility-mode upsert with non-OID equality pred on _id field

SERVER-10302 Use new update framework to enforce presence of _id in upserts

SERVER-1173 GetLastError After Upsert Should Include New _id

SERVER-9958 $setOnInsert should allow _id to be set