Question

我正在使用弹性RestHighLevelClient与ES交谈。我能够查询基本查询。虽然我正在尝试使用teh search_after api从前端查询设计分页的api。尽管query_after在RestLowLevelClient api中很容易使用，但我无法弄清楚如何在HighLevel API中使用它。

看起来像lucene api有SearchAfterSortedDocQuery，但是我不知道如何在弹性搜索api中使用它。例如：在下面的代码中，我初始化SearchAfterSortedDocQuery查询，但不确定如何使用它。

        RestHighLevelClient client = ESRestClient.getClient();

        SearchRequest searchRequest = new SearchRequest();
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        searchSourceBuilder.query(QueryBuilders.termQuery("field1",value1));
        searchSourceBuilder.query(QueryBuilders.termQuery("field2",value2));

        searchSourceBuilder.from(0);
        searchSourceBuilder.size(limit);
        SortField[] sortFields = new SortField[2];

        sortFields[0]= new SortField("field1", SortField.Type.LONG);
        sortFields[1]= new SortField("field2", SortField.Type.LONG);


        FieldDoc fieldDoc = new FieldDoc(0,0); //Is this correct? how to initialize field doc?
        fieldDoc.fields = new Object[2];
        fieldDoc.fields[0] = new Long("-156034");
        fieldDoc.fields[1] = new Long("2297416849");

        SearchAfterSortedDocQuery query = new SearchAfterSortedDocQuery(new Sort(sortFields), fieldDoc);
        searchRequest.source(searchSourceBuilder);
        searchRequest.indices("index1");

        try {
            SearchResponse response = client.search(searchRequest, RequestOptions.DEFAULT);
            System.out.println(response);
        }
        catch(IOException e){
            System.out.println(e);
        }

    }

Answer 1

我认为不是您使用SearchAfterSortedDocQuery，而是在searchSourceBuilder中设置search_after，如下所示

searchSourceBuilder.searchAfter(new Object[]{sortAfterValue});

然后使用SearchRequest和rest客户获取响应

SearchRequest searchRequest = new SearchRequest("index");
    searchRequest.types("type");
    searchRequest.source(searchSourceBuilder);

    SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT)
    SearchHits hits = searchResponse.getHits();

最后，您应该保留点击中getSortValues（）的最后一个排序值，以转到下一页。

hits.getAt(lastIndex).getSortValues()

Elasticsearch search_after api

希望获得帮助。

如何在Elastic High Level Rest Client中使用search_after进行分页

1 个答案: