A {@link HitCollector} implementation that collects the top-sorting
/// documents, returning them as a {@link TopFieldDocs}. This is used by {@link
/// IndexSearcher} to implement {@link TopFieldDocs}-based search.
///
/// This may be extended, overriding the collect method to, e.g.,
/// conditionally invoke super()
in order to filter which
/// documents are collected.
///
///
public class TopFieldDocCollector : TopDocCollector
{
///