Projection operators specify the fields returned by an operation.
find() operations on views do not support
the following Query and Projection Operators operators:
For details on a specific operator, including syntax and examples, click on the link to the operator's reference page.
Projects the first element in an array that matches the query condition.
Projects the first element in an array that matches the specified
Projects the available per-document metadata.
Limits the number of elements projected from an array. Supports skip and limit slices.