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[英]Elasticsearch - Java RestHighLevelClient - how to get all documents using scroll api
[英]Elasticsearch use Scroll api in Java
我试图在这里使用示例: https : //www.elastic.co/guide/en/elasticsearch/client/java-api/current/java-search-scrolling.html
关于如何在elasticsearch中与Java一起使用滚动。 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.
尽管由于某些原因,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
但是在本教程中应该是它。
蚂蚁的想法是什么问题?
RestHighLevelClient的工作原理不同于TransportClient。
如果希望将滚动与RestHighLevelClient一起使用,则必须遵循以下步骤:
1)创建一个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);
客户端是RestHighLevelClient。
3)对于后续的滚动搜索,请创建一个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,请参见: Search Scroll API
在Elasticsearch 6中,有两个API
错误表示您已使用REST Api和TRANSPORT Api代码的客户端。
您需要使用此客户端Api: https : //www.elastic.co/guide/en/elasticsearch/client/java-api/current/transport-client.html
但是,如果您使用REST api,那将是有益的,因为elasticsearch将来会删除TRANSPORT Api。
这是REST Api的滚动请求: https : //www.elastic.co/guide/en/elasticsearch/client/java-rest/6.3/java-rest-high-search-scroll.html
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