Using the projection $elemMatch causes all other fields not to be selected in query response

Currently, using the $elemMatch projection as a part of the field selection causes all other fields in the collection not to be included in the query response.

For example, given the following document:

{

   _id: ObjectId(),

   name: "Sample",

   image: "sample.jpg",

   members: [

                { name: "John", city: "Calgary" },

                { name: "Gerry", city: "Berlin" }]

}

The query

db.projects.find({}, {dependents: { $elemMatch: { city: "Calgary" } } });

would yield the following result:

[{ 

   _id: ObjectId(),

   members: [ { name: "John", city: "Calgary" } ] 

}]

There should be a way to include all fields to be selected (perhaps by default).

In the MongoDB document titled "Retrieving a Subset of Fields", it mentions that "Filtering with $slice does not affect other fields inclusion/exclusion. It only applies within the array being sliced." It would be appropriate if this same logic is applied to the $elemMatch projection. Also, the documentation should be adjusted to reflect the field inclusion/exclusion behaviour.