Under SERVER-24506 we are introducing a ListCollectionFilter class, used to request only views or collections from the listCollections command. For backward compatibility with MongoDB 3.2 and older, the collection filter is specified as:

{$or: [{type: "collection"},{type: {$exists: false}}]}

Once master is no longer cross-compatible with versions of MongoDB 3.2 or under are no longer supported, this can be simplified to:

{type: "collection"}