code: func NewLucene41PostingsFormatWith(minTermBlockSize, maxTermBlockSize int) *Lucene41PostingsFormat {
  	assert(minTermBlockSize > 1)
  	assert(minTermBlockSize <= maxTermBlockSize)
  	return &Lucene41PostingsFormat{
  		minTermBlockSize: minTermBlockSize,
  		maxTermBlockSize: maxTermBlockSize,
  	}
  }
docs: /*
  Creates Lucene41PostingsFormat with custom values for minBlockSize
  and maxBlockSize passed to block terms directory.
  */