설명 잘 나옴 https://www.inflearn.com/course/elk-%EC%8A%A4%ED%83%9D-%EB%8D%B0%EC%9D%B4%ED%84%B0-%EB%B6%84%EC%84%9D/dashboard
쿼리 잘 나와있음 https://github.com/minsuk-heo/BigData/tree/master0
