通過 elasticsearch-hadoop可以將spark 處理後的數據保存在Elastic上，後續數據的檢查和查詢非常方便。
https://db-blog.web.cern.ch/blog/prasanth-kothuri/2016-05-integrating-hadoop-and-elasticsearch-%E2%80%93-part-2-%E2%80%93-writing-and-querying
https://www.elastic.co/guide/en/elasticsearch/hadoop/master/spark.html
https://spark-packages.org/package/elastic/elasticsearch-hadoop