es滚动查询示例

import org.elasticsearch.action.search.*;
import org.elasticsearch.client.*;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.SearchHit;

import java.util.ArrayList;
import java.util.List;

public class ScrollQueryExample {
    public static void main(String[] args) throws Exception {
        // 创建 Elasticsearch 客户端
        RestClient restClient = RestClient.builder(new HttpHost("localhost", 9200)).build();

        // 创建一个初始搜索请求
        SearchRequest searchRequest = new SearchRequest("your_index_name");
        searchRequest.scroll(TimeValue.timeValueMinutes(1)); // 设置滚动的保持时间

        // 设置搜索查询条件，可以根据您的需求进行更改
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        searchSourceBuilder.query(QueryBuilders.matchAllQuery()); // 匹配所有文档

        searchRequest.source(searchSourceBuilder);

        // 执行初始搜索请求
        SearchResponse searchResponse = restClient.search(searchRequest, RequestOptions.DEFAULT);

        // 存储滚动标识符
        String scrollId = searchResponse.getScrollId();

        List<Map<String, Object>> documentList = new ArrayList<>();

        while (true) {
            // 遍历滚动结果
            for (SearchHit hit : searchResponse.getHits().getHits()) {
                documentList.add(hit.getSourceAsMap());
            }

            // 创建一个新的滚动请求
            SearchScrollRequest scrollRequest = new SearchScrollRequest(scrollId);
            scrollRequest.scroll(TimeValue.timeValueMinutes(1)); // 设置滚动的保持时间

            // 执行滚动请求
            searchResponse = restClient.scroll(scrollRequest, RequestOptions.DEFAULT);

            // 检查是否有更多的文档需要滚动
            if (searchResponse.getHits().getHits().length == 0) {
                break;
            }
        }

        // 清除滚动上下文
        ClearScrollRequest clearScrollRequest = new ClearScrollRequest();
        clearScrollRequest.addScrollId(scrollId);
        ClearScrollResponse clearScrollResponse = restClient.clearScroll(clearScrollRequest, RequestOptions.DEFAULT);

        // 关闭 Elasticsearch 客户端
        restClient.close();

        // 现在，documentList 包含了所有文档的数据
        for (Map<String, Object> document : documentList) {
            System.out.println(document);
        }
    }
}

POST /your_index_name/_search?scroll=1m
{
  "size": 100,
  "query": {
    "match_all": {}
  }
}

POST /_search/scroll
{
  "scroll": "1m",
  "_scroll_id": "your_previous_scroll_id"
}