A scroll query is used to retrieve large numbers of documents from Elasticsearch efficiently, without paying the penalty of deep pagination.scroll query는 Elasticsearch에서 매우 많은 수의 document를, deep 페이지 계산의 불이익 없이, 효과적으로 가져오기 위해 함께 사용된다.Scrolling allows us to do an initial search and to keep pulling batches of results from Elasticsearch until there are no more results left. It’s a bit like a cursor ..