推荐博客:
阮一峰大神:http://www.ruanyifeng.com/blog/2017/08/elasticsearch.html
ElasticSearch 权威指南(中文版):https://www.elastic.co/guide/cn/elasticsearch/guide/current/index.html
Elasticsearch教程:https://www.sojson.com/blog/81.html
ik分词器下载地址:https://github.com/medcl/elasticsearch-analysis-ik/releases