'How to delete the element from document in Mongodb?

I have this collection in MongoDB and I want to delete "Bangalore" as shown below.

{
    "_id": "1",
    "UserName": "Mike",
    "UserDetails": [{
        "UserCountryName": "India",
        "UserLocation": [
            "Bangalore",
            "Chennai",
            "Delhi",
            "Mumbai"
        ]
    }]
}

I tried the below query but it didn't work. The whole UserDetails array is getting deleted. I want only "Banglore" to be deleted. Please help.

db.user.update( 
  { }, 
  { $pull: { "UserDetails": {"UserLocation":"Bangalore"} } } 
)
arraysmongodbpull


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