[大数据]java操作es（elasticsearch）使用scroll取出全部数据

public void scrollDemo() {
        //transportClient配置自行处理,此处不做演示
        SearchResponse scrollResp = transportClient.prepareSearch("order_stage")//指定index
                .setTypes("order")//指定type
                //.addSort(FieldSortBuilder.DOC_FIELD_NAME, SortOrder.ASC)//指定排序
                //.setQuery(QueryBuilders.termQuery("user","张三"))//指定搜索条件
                .setScroll(TimeValue.timeValueSeconds(30)) //每次查询所需的时间，超时自动释放scroll，根据具体业务场景设置，scroll长时间不释放会占用内存影响效率，不要设置太大
                .setSize(1000).get(); //每次查询的数量
        do {
            for (SearchHit hit : scrollResp.getHits().getHits()) {
                //业务处理逻辑

            }
            scrollResp = transportClient.prepareSearchScroll(scrollResp.getScrollId()).setScroll(TimeValue.timeValueSeconds(30)).execute().actionGet();

        } while (scrollResp.getHits().getHits().length != 0); // Zero hits mark the end of the scroll and the while loop.

        //处理完成及时释放scroll
        clearScroll(transportClient, scrollResp.getScrollId());
    }

/**
     * 清除滚动ID
     *
     * @param client
     * @param scrollId
     * @return
     */
    public boolean clearScroll(Client client, String scrollId) {
        ClearScrollRequestBuilder clearScrollRequestBuilder = client.prepareClearScroll();
        clearScrollRequestBuilder.addScrollId(scrollId);
        ClearScrollResponse response = clearScrollRequestBuilder.get();
        log.info("清除游标成功。。。");
        return response.isSucceeded();
    }