spring-boot - Spring 启动 Elasticsearch "search_after"

Question

如何在 spring boot NativeSearchQueryBuilder 中将“search_after”(https://www.elastic.co/guide/en/elasticsearch/reference/6.4/search-request-search-after.html)添加到我的 elasticsearch 查询中？

Answer 1

是的，您可以将 NativeSearchQueryBuilder 与自定义查询结合使用以获得所需的结果。

NativeSearchQueryBuilder 不提供在之后添加搜索的方法。

但是您可以使用使用 native 构建器构建的查询来发出带有搜索后参数的字符串查询请求。

这是一个例子。

import org.springframework.data.elasticsearch.core.query.NativeSearchQueryBuilder;
import org.springframework.data.elasticsearch.core.EntityMapper;

...

var queryBuilder = new NativeSearchQueryBuilder().withQuery(BoolQueryBuilder.boolQuery());

var jsonQuery = new JSONObject();
jsonQuery.put("size", SEARCH_AFTER_PAGE_SIZE);
jsonQuery.put("query", new JSONObject(queryBuilder.build().getQuery().toString()));
     
var sortList = new JSONObject();
for (Sort.Order order : sort) {
    sortList.put(order.getProperty(), order.getDirection());
}
jsonQuery.put("sort", sortList);

String businessSortMarker = "previous order value 1";
String tiebreakerSortMarker = "previous order value 2";
if (searchAfterParameters != null) {
    jsonQuery.put("search_after", Arrays.asList(businessSortMarker, tiebreakerSortMarker));
}
var query = new Search.Builder(searchAfterQuery.toString()).build();
SearchResult result =  client.execute(query);
var resultPage = new SearchResultsPage<ResultObject>();

EsEntityMapper documentsMapper = new EsEntityMapper();
searchResult.getHits(JsonObject.class).stream()
            .map(hitJson -> hitJson.source)
            .map(source -> documentsMapper.mapToObject(searchResultJson.toString(), SearchResult.class))
            .collect(Collectors.toList());
//map the documents itself (content)
var resultObject = mapHitsSourceToResultObjects(searchResult);
resultPage.setContent(resultObject);

您可以在此处查看更多详细信息: https://www.shardik.com/blog/2021/03/09/es-deep-search/