hanlp-ext 插件源码地址：http://git.oschina.net/hualongdata/hanlp-ext 或 https://github.com/hualongdata/hanlp-ext
Elasticsearch 默认对中文分词是按“字”进行分词的，这是肯定不能达到我们进行分词搜索的要求的。官方有一个 SmartCN 中文分词插件，另外还有一个 IK 分词插件使用也比较广。但这里，我们采用 HanLP 这款 自然语言处理工具 来进行中文分词。
Elasticsearch
Elasticsearch 的默认分词效果是惨不忍睹的。
GET /_analyze?pretty {"text": ["重庆华龙网海数科技有限公司"] }
输出：
{"tokens": [ {"token":"重","start_offset":0,"end_offset":1,"type":"<IDEOGRAPHIC>","position":0}, {"token":"庆","start_offset":1,"end_offset":2,"type":"<IDEOGRAPHIC>","position":1}, {"token":"华","start_offset":2,"end_offset":3,"type":"<IDEOGRAPHIC>","position":2}, {"token":"龙","start_offset":3,"end_offset":4,"type":"<IDEOGRAPHIC>","position":3}, {"token":"网","start_offset":4,"end_offset":5,"type":"<IDEOGRAPHIC>","position":4}, {"token":"海","start_offset":5,"end_offset":6,"type":"<IDEOGRAPHIC>","position":5}, {"token":"数","start_offset":6,"end_offset":7,"type":"<IDEOGRAPHIC>","position":6}, {"token":"科","start_offset":7,"end_offset":8,"type":"<IDEOGRAPHIC>","position":7}, {"token":"技","start_offset":8,"end_offset":9,"type":"<IDEOGRAPHIC>","position":8}, {"token":"有","start_offset":9,"end_offset":10,"type":"<IDEOGRAPHIC>","position":9}, {"token":"限","start_offset":10,"end_offset":11,"type":"<IDEOGRAPHIC>","position":10}, {"token":"公","start_offset":11,"end_offset":12,"type":"<IDEOGRAPHIC>","position":11}, {"token":"司","start_offset":12,"end_offset":13,"type":"<IDEOGRAPHIC>","position":12} ]}
可以看到，默认是按字进行分词的。
elasticsearch-hanlp
HanLP
HanLP 是一款使用 Java 实现的优秀的，具有如下功能：
中文分词
词性标注
命名实体识别
关键词提取
自动摘要
短语提取
拼音转换
简繁转换
文本推荐
依存句法分析
语料库工具
安装 elasticsearch-hanlp（安装见：https://github.com/hualongdata/hanlp-ext/tree/master/es-plugin）插件以后，我们再来看看分词效果。
GET /_analyze?pretty {"analyzer":"hanlp","text": ["重庆华龙网海数科技有限公司"] }
输出：
{"tokens": [ {"token":"重庆","start_offset":0,"end_offset":2,"type":"ns","position":0}, {"token":"华龙网","start_offset":2,"end_offset":5,"type":"nr","position":1}, {"token":"海数","start_offset":5,"end_offset":7,"type":"nr","position":2}, {"token":"科技","start_offset":7,"end_offset":9,"type":"n","position":3}, {"token":"有限公司","start_offset":9,"end_offset":13,"type":"nis","position":4} ]}
HanLP 的功能不止简单的中文分词，有很多功能都可以集成到 Elasticsearch 中。
文章来源于羊八井的博客。
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