参考书籍：《Elastic Stack 应用宝典》 官方手册： https://www.elastic.co/guide/en/elasticsearch/reference/7.9/mapping-fields.htmlhttps://www.elastic.co/guide/en/elasticsearch/reference/7.9/mapping-types.htmlhttps://www.elastic.co/guide/en/elasticsearch/reference/7.9/mapping-params.html
