* @param ics a collection of index creators for updating unpacked documents.
*/
public static Date unpackIndexData( final InputStream is, final Directory d, final IndexingContext context )
throws IOException
{
NexusIndexWriter w = new NexusIndexWriter( d, new NexusAnalyzer(), true );
try
{
IndexDataReader dr = new IndexDataReader( is );
IndexDataReadResult result = dr.readIndex( w, context );