sort - The sort order to pick which document to return if the filter selects multiple documents.
projection - Specifies which fields should be included/excluded in the returned documents.
limit - Max number of documents to return in the lifetime of the cursor.
skip - Number of documents to skip if using a sort.
includeSimilarity - If true, include the similarity score in the result via the $similarity field.
Collection.find
Options for the collection
findmethod.