elasticsearch-analysis-ik

IK Analyzer for Elasticsearch

License

License

Categories

Categories

Search Business Logic Libraries Elasticsearch
GroupId

GroupId

org.elasticsearch
ArtifactId

ArtifactId

elasticsearch-analysis-ik
Last Version

Last Version

6.1.1
Release Date

Release Date

Type

Type

jar
Description

Description

elasticsearch-analysis-ik
IK Analyzer for Elasticsearch
Source Code Management

Source Code Management

http://github.com/medcl/elasticsearch-analysis-ik

Download elasticsearch-analysis-ik

How to add to project

<!-- https://jarcasting.com/artifacts/org.elasticsearch/elasticsearch-analysis-ik/ -->
<dependency>
    <groupId>org.elasticsearch</groupId>
    <artifactId>elasticsearch-analysis-ik</artifactId>
    <version>6.1.1</version>
</dependency>
// https://jarcasting.com/artifacts/org.elasticsearch/elasticsearch-analysis-ik/
implementation 'org.elasticsearch:elasticsearch-analysis-ik:6.1.1'
// https://jarcasting.com/artifacts/org.elasticsearch/elasticsearch-analysis-ik/
implementation ("org.elasticsearch:elasticsearch-analysis-ik:6.1.1")
'org.elasticsearch:elasticsearch-analysis-ik:jar:6.1.1'
<dependency org="org.elasticsearch" name="elasticsearch-analysis-ik" rev="6.1.1">
  <artifact name="elasticsearch-analysis-ik" type="jar" />
</dependency>
@Grapes(
@Grab(group='org.elasticsearch', module='elasticsearch-analysis-ik', version='6.1.1')
)
libraryDependencies += "org.elasticsearch" % "elasticsearch-analysis-ik" % "6.1.1"
[org.elasticsearch/elasticsearch-analysis-ik "6.1.1"]

Dependencies

compile (3)

Group / Artifact Type Version
org.elasticsearch : elasticsearch jar 6.1.1
org.apache.httpcomponents : httpclient jar 4.5.2
org.apache.logging.log4j : log4j-api jar 2.3

test (3)

Group / Artifact Type Version
org.hamcrest : hamcrest-core jar 1.3
org.hamcrest : hamcrest-library jar 1.3
junit : junit jar 4.12

Project Modules

There are no modules declared in this project.

IK Analysis for Elasticsearch

The IK Analysis plugin integrates Lucene IK analyzer (http://code.google.com/p/ik-analyzer/) into elasticsearch, support customized dictionary.

Analyzer: ik_smart , ik_max_word , Tokenizer: ik_smart , ik_max_word

Versions

IK version ES version
master 7.x -> master
6.x 6.x
5.x 5.x
1.10.6 2.4.6
1.9.5 2.3.5
1.8.1 2.2.1
1.7.0 2.1.1
1.5.0 2.0.0
1.2.6 1.0.0
1.2.5 0.90.x
1.1.3 0.20.x
1.0.0 0.16.2 -> 0.19.0

Install

1.download or compile

  • optional 1 - download pre-build package from here: https://github.com/medcl/elasticsearch-analysis-ik/releases

    create plugin folder cd your-es-root/plugins/ && mkdir ik

    unzip plugin to folder your-es-root/plugins/ik

  • optional 2 - use elasticsearch-plugin to install ( supported from version v5.5.1 ):

    ./bin/elasticsearch-plugin install https://github.com/medcl/elasticsearch-analysis-ik/releases/download/v6.3.0/elasticsearch-analysis-ik-6.3.0.zip
    

    NOTE: replace 6.3.0 to your own elasticsearch version

2.restart elasticsearch

Quick Example

1.create a index

curl -XPUT http://localhost:9200/index

2.create a mapping

curl -XPOST http://localhost:9200/index/_mapping -H 'Content-Type:application/json' -d'
{
        "properties": {
            "content": {
                "type": "text",
                "analyzer": "ik_max_word",
                "search_analyzer": "ik_smart"
            }
        }

}'

3.index some docs

curl -XPOST http://localhost:9200/index/_create/1 -H 'Content-Type:application/json' -d'
{"content":"美国留给伊拉克的是个烂摊子吗"}
'
curl -XPOST http://localhost:9200/index/_create/2 -H 'Content-Type:application/json' -d'
{"content":"公安部:各地校车将享最高路权"}
'
curl -XPOST http://localhost:9200/index/_create/3 -H 'Content-Type:application/json' -d'
{"content":"中韩渔警冲突调查:韩警平均每天扣1艘中国渔船"}
'
curl -XPOST http://localhost:9200/index/_create/4 -H 'Content-Type:application/json' -d'
{"content":"中国驻洛杉矶领事馆遭亚裔男子枪击 嫌犯已自首"}
'

4.query with highlighting

curl -XPOST http://localhost:9200/index/_search  -H 'Content-Type:application/json' -d'
{
    "query" : { "match" : { "content" : "中国" }},
    "highlight" : {
        "pre_tags" : ["<tag1>", "<tag2>"],
        "post_tags" : ["</tag1>", "</tag2>"],
        "fields" : {
            "content" : {}
        }
    }
}
'

Result

{
    "took": 14,
    "timed_out": false,
    "_shards": {
        "total": 5,
        "successful": 5,
        "failed": 0
    },
    "hits": {
        "total": 2,
        "max_score": 2,
        "hits": [
            {
                "_index": "index",
                "_type": "fulltext",
                "_id": "4",
                "_score": 2,
                "_source": {
                    "content": "中国驻洛杉矶领事馆遭亚裔男子枪击 嫌犯已自首"
                },
                "highlight": {
                    "content": [
                        "<tag1>中国</tag1>驻洛杉矶领事馆遭亚裔男子枪击 嫌犯已自首 "
                    ]
                }
            },
            {
                "_index": "index",
                "_type": "fulltext",
                "_id": "3",
                "_score": 2,
                "_source": {
                    "content": "中韩渔警冲突调查:韩警平均每天扣1艘中国渔船"
                },
                "highlight": {
                    "content": [
                        "均每天扣1艘<tag1>中国</tag1>渔船 "
                    ]
                }
            }
        ]
    }
}

Dictionary Configuration

IKAnalyzer.cfg.xml can be located at {conf}/analysis-ik/config/IKAnalyzer.cfg.xml or {plugins}/elasticsearch-analysis-ik-*/config/IKAnalyzer.cfg.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd">
<properties>
	<comment>IK Analyzer 扩展配置</comment>
	<!--用户可以在这里配置自己的扩展字典 -->
	<entry key="ext_dict">custom/mydict.dic;custom/single_word_low_freq.dic</entry>
	 <!--用户可以在这里配置自己的扩展停止词字典-->
	<entry key="ext_stopwords">custom/ext_stopword.dic</entry>
 	<!--用户可以在这里配置远程扩展字典 -->
	<entry key="remote_ext_dict">location</entry>
 	<!--用户可以在这里配置远程扩展停止词字典-->
	<entry key="remote_ext_stopwords">http://xxx.com/xxx.dic</entry>
</properties>

热更新 IK 分词使用方法

目前该插件支持热更新 IK 分词,通过上文在 IK 配置文件中提到的如下配置

 	<!--用户可以在这里配置远程扩展字典 -->
	<entry key="remote_ext_dict">location</entry>
 	<!--用户可以在这里配置远程扩展停止词字典-->
	<entry key="remote_ext_stopwords">location</entry>

其中 location 是指一个 url,比如 http://yoursite.com/getCustomDict,该请求只需满足以下两点即可完成分词热更新。

  1. 该 http 请求需要返回两个头部(header),一个是 Last-Modified,一个是 ETag,这两者都是字符串类型,只要有一个发生变化,该插件就会去抓取新的分词进而更新词库。

  2. 该 http 请求返回的内容格式是一行一个分词,换行符用 \n 即可。

满足上面两点要求就可以实现热更新分词了,不需要重启 ES 实例。

可以将需自动更新的热词放在一个 UTF-8 编码的 .txt 文件里,放在 nginx 或其他简易 http server 下,当 .txt 文件修改时,http server 会在客户端请求该文件时自动返回相应的 Last-Modified 和 ETag。可以另外做一个工具来从业务系统提取相关词汇,并更新这个 .txt 文件。

have fun.

常见问题

1.自定义词典为什么没有生效?

请确保你的扩展词典的文本格式为 UTF8 编码

2.如何手动安装?

git clone https://github.com/medcl/elasticsearch-analysis-ik
cd elasticsearch-analysis-ik
git checkout tags/{version}
mvn clean
mvn compile
mvn package

拷贝和解压release下的文件: #{project_path}/elasticsearch-analysis-ik/target/releases/elasticsearch-analysis-ik-*.zip 到你的 elasticsearch 插件目录, 如: plugins/ik 重启elasticsearch

3.分词测试失败 请在某个索引下调用analyze接口测试,而不是直接调用analyze接口 如:

curl -XGET "http://localhost:9200/your_index/_analyze" -H 'Content-Type: application/json' -d'
{
   "text":"中华人民共和国MN","tokenizer": "my_ik"
}'
  1. ik_max_word 和 ik_smart 什么区别?

ik_max_word: 会将文本做最细粒度的拆分,比如会将“中华人民共和国国歌”拆分为“中华人民共和国,中华人民,中华,华人,人民共和国,人民,人,民,共和国,共和,和,国国,国歌”,会穷尽各种可能的组合,适合 Term Query;

ik_smart: 会做最粗粒度的拆分,比如会将“中华人民共和国国歌”拆分为“中华人民共和国,国歌”,适合 Phrase 查询。

Changes

自 v5.0.0 起

  • 移除名为 ik 的analyzer和tokenizer,请分别使用 ik_smartik_max_word

Thanks

YourKit supports IK Analysis for ElasticSearch project with its full-featured Java Profiler. YourKit, LLC is the creator of innovative and intelligent tools for profiling Java and .NET applications. Take a look at YourKit's leading software products: YourKit Java Profiler and YourKit .NET Profiler.

Versions

Version
6.1.1
5.2.2
5.2.1
5.2.0
5.1.2
5.1.1
5.0.2
5.0.1
5.0.0
5.0.0-rc1
5.0.0-beta1
5.0.0-alpha5
1.10.3
1.10.2
1.10.1
1.9.5
1.9.4