Reporting this as a bug BUT i would have expected the linq query to generate the same qeury under the covers as the find query.  Instead the linq query is generating an aggregation pipeline.

```

      var document = GetCollection<MediaDocument>()

                .Find(x => x.ImageUniqueIdentifier == imageUniqueIdentifier)

                .FirstOrDefault();

```

```

            var document = GetCollection<MediaDocument>()

                .AsQueryable()

                .Where(x => x.ImageUniqueIdentifier == imageUniqueIdentifier)

                .FirstOrDefault();

```