message: Exposing Field
diff: @@ -128,7 +128,7 @@ pub use directory::Directory;
  pub use core::{Index, Segment, SegmentId, SegmentMeta, Searcher};
  pub use indexer::IndexWriter;
  pub use schema::{Term, Document};
  -pub use core::SegmentReader;
  +pub use core::{SegmentReader, FieldReader};
  pub use self::common::TimerTree;
  pub use postings::DocSet;
  