MongoDB: Unable to find required records - mongodb

Question

I am new to MongoDB. And I have following collections in my MongoDB. My Problem is I am not able to make a find command which gives required facilities based on provided ID or Name.
Find command which I have tried BUT NOT working :-
db.mgh_facilities.find({facilities: {$elemMatch: {name: "Foreign exchange assistance"}}}).
For me its returning all the records. Shouldn't it be just returning { "id" : "11", "name" : "Foreign exchange assistance" }
My Collections:-
{
"_id" : ObjectId("548acc28ae6ff1c0fd1d7470"),
"responseCode" : "true",
"facilities" : [
{
"id" : "11",
"name" : "Foreign exchange assistance"
},
{
"id" : "12",
"name" : "Assistance with luggage on request"
},
{
"id" : "13",
"name" : "24 hours power back-up"
},
{
"id" : "14",
"name" : "A/C Power Backup Available"
},
{
"id" : "15",
"name" : "swimming pool"
},
{
"id" : "35",
"name" : "shoe cleaning service"
},
{
"id" : "36",
"name" : "Smoke detectors"
},
{
"id" : "37",
"name" : "Fire Extinguishers in each room"
},
{
"id" : "38",
"name" : "Pest Control"
},
{
"id" : "39",
"name" : "Conference / Banquet Hall"
},
{
"id" : "45",
"name" : "Restaurant"
},
{
"id" : "53",
"name" : "Anti-slip ramps"
},
{
"id" : "56",
"name" : "Tea/ Coffee Maker in the Rooms"
},
{
"id" : "59",
"name" : "Wi Fi Internet"
}
]
}

Answer 1

The find command has found the document which contains the facility object with a name matching your search. It doesn't know that you only want to see the single subdocument responsible for that document matching your search criteria.
You can tell mongo that you want to see that element with the positional $ operator.
db.mgh_facilities.find({"facilities.name": "Foreign exchange assistance"}, {"facilities.$": true})

Answer 2

You can try this
db.mgh_facilities.aggregate([
{
$unwind:"$facilities"
},
{
$match:{"facilities.name": "Foreign exchange assistance"}
},{
$project:{
_id:0,
facilities:1
}
}
])
result:
{
"result" : [
{
"facilities" : {
"id" : "11",
"name" : "Foreign exchange assistance"
}
}
],
"ok" : 1
}