简述

Trying to create more than 500 scroll contexts will not be allowed in the next major version by default
 You can change the  [search.max_open_scroll_context] setting to use a greater default value or lower the number of scrolls that you need to run in parallel."

问题原因

Elasticsearch 使用scroll时，中设置的timeout时间内，累计生成的scroll_id数超过了最大限制

问题解决方式

• 减小timeout设置

 SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
            searchSourceBuilder.query(queryBuilder);
            searchSourceBuilder.size(5000);
            SearchRequest searchRequest = new SearchRequest();
            searchRequest.source(searchSourceBuilder);
            TimeValue timeValue = new TimeValue(3000);
            searchRequest.scroll(timeValue);
            searchRequest.indices("");

• 清理scroll

 ClearScrollRequest clearScrollRequest = new ClearScrollRequest();
                clearScrollRequest.addScrollId(scrollId);// 也可以选择setScrollIds()将多个scrollId一起使用
                ClearScrollResponse clearScrollResponse = null;
                try {
                    clearScrollResponse = produceRestClient.clearScroll(clearScrollRequest, RequestOptions.DEFAULT);
                } catch (IOException e) {
                    e.printStackTrace();
                }
                boolean succeeded = clearScrollResponse.isSucceeded();
                log.info("--------------->>>>{}-----", succeeded);