ElasticSearch 5.2.2 发布了。Elastic Search 是一个基于Lucene构建的开源，分布式，RESTful 搜索引擎。设计用于云计算中，能够达到实时搜索，稳定，可靠，快速，安装使用方便。支持通过 HTTP 使用 JSON 进行数据索引。
更新内容：
Bug 修复
Aggregations
Restore support for the include/pattern syntax
Cluster
Don’t set local node on cluster state used for node join validation
Cluster allocation explain to never return empty response body
Index APIs
Ensure shrunk indices carry over version information from its source
Internal
Always restore the ThreadContext for operations delayed due to a block
Java REST Client
RestClient asynchronous execution should not throw exceptions
Network
Respect promises on pipelined responses
Ensure that releasing listener is called
Plugin Ingest Attachment
Remove support for Visio and potm files
REST
Properly encode location header
Stats
Fix control group pattern
下载地址：
https://www.elastic.co/downloads/elasticsearch
来自:开源中国社区
