https://m.aliyun.com/yunqi/articles/60474
https://www.jianshu.com/c/d5c542376948
https://www.elastic.co/blog/managing-time-based-indices-efficiently
https://www.elastic.co/elasticon/conf/2016/sf/quantitative-cluster-sizing
https://www.elastic.co/elasticon/conf/2018/sf/elasticsearch-sql
https://www.elastic.co/guide/en/elasticsearch/guide/2.x/scale.html
https://www.elastic.co/blog/resizing-elasticsearch-shards-for-fun-and-profit
https://www.elastic.co/guide/en/elasticsearch/guide/current/translog.html
https://www.elastic.co/guide/en/elasticsearch/guide/current/merge-process.html
ES查询流程剖析
Elasticsearch 写入流程简介
https://yq.aliyun.com/articles/576223
https://yq.aliyun.com/articles/573660
http://makble.com/what-is-term-vector-in-lucene
https://www.elastic.co/blog/how-many-shards-should-i-have-in-my-elasticsearch-cluster
http://queirozf.com/entries/what-do-store-index-all-source-mean-in-elasticsearch
http://grokbase.com/t/gg/elasticsearch/1324nc7mjj/fitting-inverted-list-in-memory
https://www.elastic.co/guide/en/elasticsearch/reference/current/mapping-source-field.html
https://www.elastic.co/guide/en/elasticsearch/guide/current/_limiting_memory_usage.html
http://alexander.holbreich.org/elasticsearch-datastructures/
https://www.loggly.com/blog/scaling-elasticsearch-for-multi-tenant-multi-cluster/
https://www.loggly.com/blog/pays-elasticsearch-developers-know-cluster-state/
https://www.loggly.com/blog/nine-tips-configuring-elasticsearch-for-high-performance/
https://www.oreilly.com/ideas/10-elasticsearch-metrics-to-watch
https://qbox.io/blog/maximize-guide-elasticsearch-indexing-performance-part-2
ES多集群
https://www.loggly.com/blog/scaling-elasticsearch-for-multi-tenant-multi-cluster/
https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-cross-cluster-search.html
https://www.loggly.com/blog/nine-tips-configuring-elasticsearch-for-high-performance/
https://www.elastic.co/blog/tribe-node
https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-cross-cluster-search.html
https://www.loggly.com/blog/pays-elasticsearch-developers-know-cluster-state/
https://www.loggly.com/blog/monitoring-ansible-plays-in-four-simple-steps/
https://www.elastic.co/blog/tribe-node