es-in-action es 样例学习 acknowledgement 关闭嗅探器：https://l4qiang.me/2019/04/16/es/sniff/ docker 部署: http://testingpai.com/article/1600658705363 https://stackoverflow.com/questions/29016271/how-to-get-latest-values-for-each-group-with-an-elasticsearch-query https://elasticsearch.cn/article/629