java - Elasticsearch 在 Java 中使用 Scroll api

Question

我试着用这里的例子: https://www.elastic.co/guide/en/elasticsearch/client/java-api/current/java-search-scrolling.html

关于如何在 elasticsearch 中使用 java 滚动。这是代码:

QueryBuilder qb = termQuery("multi", "test");

SearchResponse scrollResp = client.prepareSearch("test")
        .addSort(FieldSortBuilder.DOC_FIELD_NAME, SortOrder.ASC)
        .setScroll(new TimeValue(60000))
        .setQuery(qb)
        .setSize(100).get(); //max of 100 hits will be returned for each scroll
//Scroll until no hits are returned
do {
for (SearchHit hit : scrollResp.getHits().getHits()) {
    //Handle the hit...
}

scrollResp = client.prepareSearchScroll(scrollResp.getScrollId()).setScroll(new TimeValue(60000)).execute().actionGet();
} while(scrollResp.getHits().getHits().length != 0); // Zero hits mark the end of the scroll and the while loop.

虽然出于某些原因我有一个错误提示 The method prepareSearch(String) is undefined for the type RestHighLevelClient。我的 client 变量确实是 RestHighLevelClient 但在教程中它应该是什么。

Ant 的思路是什么问题？

Answer 1

RestHighLevelClient 的工作方式与 TransportClient 不同。

如果您希望将滚动与 RestHighLevelClient 一起使用，则必须遵循以下步骤:

1. 创建 SearchRequest :

   SearchRequest request = new SearchRequest("test").scroll(new TimeValue(60000));SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();searchSourceBuilder.query(qb);searchSourceBuilder.sort(FieldSortBuilder.DOC_FIELD_NAME, SortOrder.ASC);request.source(searchSourceBuilder);

2. 执行第一个搜索:

   SearchResponse scrollResp = client.search(sreq);

这里的客户端是RestHighLevelClient。

1. 对于后续的滚动搜索，创建一个 SearchScrollRequest，然后将其用于滚动:

   scrollResp = client.searchScroll(new SearchScrollRequest(scrollResponse.getScrollId()).scroll(new TimeValue(60000)));

有关更多信息，请参阅:Search Scroll API