Find an element in a collection, using a modifier.
collection The name of the database and collection that is the target of the find operation, formatted as ''database.collection''.
jsonQuery The JSON query to execute on the database.
modifier A JSON object containing the set of modifiers, such as ordering predicates. For a full list of modifiers, see http://docs.mongodb.org/manual/reference/operator/query-modifier/.
numberToReturn The maximum number of documents to return. Set to zero to use the default.