https://blog.csdn.net/bsh_csn/article/details/53908406

{"number":32768,"singer":"杨坤","size":"777","song":"今夜20岁","tag":"中国好声音","timelen":319}  

https://yulinfeng.gitbooks.io/elasticsearch/content/
https://github.com/yu-linfeng/elasticsearch6.x_tutorial
https://www.cnblogs.com/yulinfeng/p/11229352.html