Elasticsearch Scroll分页检索案例分享

@Test
	public void testScroll(){
		ClientInterface clientUtil = ElasticSearchHelper.getConfigRestClientUtil("esmapper/scroll.xml");
		//scroll分页检索，将检索结果映射为Map对象，也可以映射为自定义的实体对象
		ESDatas response = clientUtil.searchList("agentstat-*/_search?scroll=1m",
                              "scrollQuery",//对于dsl脚本名称，在esmapper/scroll.xml文件中配置
                               Map.class);
		List datas = response.getDatas();//第一页数据
		List scrollIds = new ArrayList<>();//用于记录每次scroll的scrollid，便于检索完毕后清除
		long totalSize = response.getTotalSize();//总记录数
		String scrollId = response.getScrollId();
		if(scrollId != null)
			scrollIds.add(scrollId);
		System.out.println("totalSize:"+totalSize);
		System.out.println("scrollId:"+scrollId);
		if(datas != null && datas.size() > 0) {//每页1000条记录，通过迭代scrollid，遍历scroll分页结果
			do {

				response = clientUtil.searchScroll("1m",scrollId,Map.class);
				scrollId = response.getScrollId();//每页的scrollid
				if(scrollId != null)
					scrollIds.add(scrollId);
				datas = response.getDatas();//每页的纪录数
				if(datas == null || datas.size() == 0){
					break;
				}
			} while (true);
		}
		//查询并打印存在于es服务器上的scroll上下文信息
		String scrolls = clientUtil.executeHttp("_nodes/stats/indices/search", ClientUtil.HTTP_GET);
		System.out.println(scrolls);
		//清除scroll上下文信息,虽然说超过1分钟后，scrollid会自动失效，但是手动删除不用的scrollid，释放es资源是一个好习惯
		if(scrollIds.size() > 0) {
			scrolls = clientUtil.deleteScrolls(scrollIds);
			System.out.println(scrolls);
		}
		//清理完毕后查看scroll上下文信息
		scrolls = clientUtil.executeHttp("_nodes/stats/indices/search", ClientUtil.HTTP_GET);
		System.out.println(scrolls);
	}