ListModel.findOne({
"_id" : "57e6bcab6b383120f0395aed", 'recipients.status' : 1
},
{
_id:1, name: 1, subject:1,'recipients.$': 1
},
function(err,list) {...}
);
System.findOne({ 'nodes.main.Alpha': 23000}, function(err, system){
if(err){console.log(err);}
else{console.log(system);}
});