question: public ParallelCompositeReader ( boolean closeSubReaders , CompositeReader [ ] readers , CompositeReader [ ] storedFieldReaders ) throws IOException { super ( prepareLeafReaders ( readers , storedFieldReaders ) ) ; this . closeSubReaders = closeSubReaders ; Collections . addAll ( completeReaderSet , readers ) ; Collections . addAll ( completeReaderSet , storedFieldReaders ) ; if ( ! closeSubReaders ) { for ( final IndexReader reader : completeReaderSet ) { reader . incRef ( ) ; } } completeReaderSet . addAll ( getSequentialSubReaders ( ) ) ; }
target:  Expert: create a ParallelCompositeReader based on the provided readers and storedFieldReaders; when a document is loaded, only storedFieldsReaders will be used. 