code: func (conf *IndexWriterConfig) SetReaderPooling(readerPooling bool) *IndexWriterConfig {
  	conf.readerPooling = readerPooling
  	return conf
  }
docs: // L406
  /*
  By default, IndexWriter does not pool the SegmentReaders it must open
  for deletions and merging, unless a near-real-time reader has been
  obtained by calling openDirectoryReader(IndexWriter, bool). This
  method lets you enable pooling without getting a near-real-time
  reader. NOTE: if you set this to false, IndexWriter will still pool
  readers once openDirectoryReader(IndexWriter, bool) is called.
  */