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Update elasticsearch-interview.md
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docs/nosql/elasticsearch/elasticsearch-interview.md

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你往 es 里写的数据,实际上都写到磁盘文件里去了,**查询的时候**,操作系统会将磁盘文件里的数据自动缓存到 `filesystem cache` 里面去。
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[![es-search-process](https://github.com/doocs/advanced-java/raw/master/docs/high-concurrency/images/es-search-process.png)](https://github.com/doocs/advanced-java/blob/master/docs/high-concurrency/images/es-search-process.png)
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[![es-search-process](https://github.com/doocs/advanced-java/raw/main/docs/high-concurrency/images/es-search-process.png)](https://github.com/doocs/advanced-java/blob/master/docs/high-concurrency/images/es-search-process.png)
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es 的搜索引擎严重依赖于底层的 `filesystem cache` ,你如果给 `filesystem cache` 更多的内存,尽量让内存可以容纳所有的 `idx segment file`索引数据文件,那么你搜索的时候就基本都是走内存的,性能会非常高。
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- 实际的 node 上的 `primary shard` 处理请求,然后将数据同步到 `replica node`
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- `coordinating node` 如果发现 `primary node` 和所有 `replica node` 都搞定之后,就返回响应结果给客户端。
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[![es-write](https://github.com/doocs/advanced-java/raw/master/docs/high-concurrency/images/es-write.png)](https://github.com/doocs/advanced-java/blob/master/docs/high-concurrency/images/es-write.png)
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[![es-write](https://github.com/doocs/advanced-java/raw/main/docs/high-concurrency/images/es-write.png)](https://github.com/doocs/advanced-java/blob/master/docs/high-concurrency/images/es-write.png)
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### es 读数据过程
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