Apache Solr 6.4.0 发布了。Apache Solr (读音: SOLer) 是一个开源的搜索服务器。Solr 使用 Java 语言开发，主要基于 HTTP 和 Apache Lucene 实现。
更新内容：
Streaming:
Addition of a HavingStream to Streaming API and Streaming Expressions
Addition of a priority Streaming Expression
Streaming expressions now support collection aliases
Machine Learning:
Configurable Learning-To-Rank (LTR) support: upload feature definitions, extract feature values, upload your own machine learnt models and use them to rerank search results.
Faceting:
Added "param" query type to facet domain filter specification to obtain filters via query parameters
Any facet command can be filtered using a new parameter filter. Example: { type:terms, field:category, filter:"user:yonik" }
下载地址：http://www.apache.org/dyn/closer.lua/lucene/solr/6.4.0
软件详情：http://lucene.apache.org/solr/news.html
来自:开源中国社区
