code: func (conf *LiveIndexWriterConfigImpl) SetReaderTermsIndexDivisor(divisor int) *LiveIndexWriterConfigImpl {
  	assert2(divisor > 0 || divisor == -1, fmt.Sprintf(
  		"divisor must be >= 1, or -1 (got %v)", divisor))
  	conf.readerTermsIndexDivisor = divisor
  	return conf
  }
docs: /*
  Sets the termsIndeDivisor passed to any readers that IndexWriter
  opens, for example when applying deletes or creating a near-real-time
  reader in OpenDirectoryReader(). If you pass -1, the terms index
  won't be loaded by the readers. This is only useful in advanced
  siguations when you will only .Next() through all terms; attempts to
  seek will hit an error.
  
  takes effect immediately, but only applies to readers opened after
  this call
  
  NOTE: divisor settings > 1 do not apply to all PostingsFormat
  implementation, including the default one in this release. It only
  makes sense for terms indexes that can efficiently re-sample terms at
  load time.
  */