code: func (s *SearchSource) Slice(sliceQuery Query) *SearchSource {
  	s.sliceQuery = sliceQuery
  	return s
  }
docs: // Slice allows partitioning the documents in multiple slices.
  // It is e.g. used to slice a scroll operation, supported in
  // Elasticsearch 5.0 or later.
  // See https://www.elastic.co/guide/en/elasticsearch/reference/7.0/search-request-scroll.html#sliced-scroll
  // for details.