Es优化

1. es的所有内容都可以通过官网文档查看
   网址: https://www.elastic.co/guide/en/elasticsearch/reference/7.x/query-cache.html

2. es默认查询只会展示前1W条数据
   在官方文档中有描述

   By default, the cache holds a maximum of 10000 queries in up to 10% of the total heap space. To determine if a query is eligible for caching, Elasticsearch maintains a query history to track occurrences.

最多缓存 1w 条查询结果,最多占总堆空间的 10%

…. to be continued

https://www.elastic.co/guide/en/elasticsearch/reference/7.x/query-cache.html