MongoDB: how to update embeded documents in array
{_id: '4eb79ee1e60fc603788e7259',
Name: 'name',
Subsidiaries: [
  { _id: '4eb79eeae60fc603788e7271',
   Location: 'location1'},
  { _id: 'subid2',
   Location: 'location2'},
]}

db.Departments.update({ "_id" : ObjectId("4eb79ee1e60fc603788e7259"), "Subsidiaries._id" : ObjectId("4eb79eeae60fc603788e7271") }, { "$set" : { "Subsidiaries.Location" : "City" } })

db.Departments.update({ "_id" : ObjectId("4eb79ee1e60fc603788e7259"), "Subsidiaries._id" : ObjectId("4eb79eeae60fc603788e7271") }, { "$set" : { "Subsidiaries.$.Location" : "City" } })