配置elasticsearch6.5.4-ik分词插件安装，测试，扩展字典

elasticsearch基本配置上篇已经简单介绍过，本文讲述配置ik分词器插件的安装，测试，自定义扩展字典，简单使用。但愿能帮助后来者少走点弯路。

注意：ik分词器必须保证和elasticsearch版本一致，配置完成以后能够设置默认的分词工具，也能够在建立索引文件时使用ik分词工具

1. elasticsearch-ik分词环境必须跟elasticsearch一致

个人elasticsearch版本是elasticsearch-v6.5.4，因此须要下载的ik分词器版本是elasticsearch-ik-v6.5.4

下载文件:

wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.5.4.tar.gz 
wget https://github.com/medcl/elasticsearch-analysis-ik/releases/download/v6.5.4/elasticsearch-analysis-ik-6.5.4.zip 
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进入elasticsearch的安装目录，解压ik分词器内文件到plugin目录:

root @ localhost in /data/elasticsearch-6.5.4 [17:18:23]
$ l
总用量 4.8M
drwxrwxr-x   9 euser euser  198 12月 11 11:26 .
drwxr-xr-x.  7 root  root    90 1月  16 16:35 ..
drwxrwxr-x   3 euser euser 4.0K 12月 11 11:13 bin
drwxrwxr-x   2 euser euser  178 12月 11 11:32 config
drwxrwxr-x   3 euser euser   19 12月 11 11:25 data
-rwxrwxr-x   1 euser euser 4.3M 12月  6 22:30 elasticsearch-analysis-ik-6.5.4.zip
drwxrwxr-x   3 euser euser 4.0K 11月 30 08:02 lib
-rwxrwxr-x   1 euser euser  14K 11月 30 07:55 LICENSE.txt
drwxrwxrwx   2 euser euser 8.0K 2月  11 01:30 logs
drwxrwxr-x  28 euser euser 4.0K 11月 30 08:02 modules
-rwxrwxr-x   1 euser euser 395K 11月 30 08:01 NOTICE.txt
drwxrwxr-x   3 euser euser   25 12月 11 11:29 plugins
-rwxrwxr-x   1 euser euser 8.4K 11月 30 07:55 README.textile
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进入到plugin目录，建立文件夹

mkdir analysis-ik/ 
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解压ik分词器中的文件到analysis-ik目录:

# root @ iZ2zedtbewsc8oa9i1cb4tZ in /data/elasticsearch-6.5.4 [18:01:37] 
$ cd plugins/

# root @ iZ2zedtbewsc8oa9i1cb4tZ in /data/elasticsearch-6.5.4 [18:01:37] 
$ mkdir analysis-ik

# root @ iZ2zedtbewsc8oa9i1cb4tZ in /data/elasticsearch-6.5.4 [18:01:37] 
$ mv ../../../analysis-ik analysis-ik

# root @ iZ2zedtbewsc8oa9i1cb4tZ in /data/elasticsearch-6.5.4/plugins [18:04:29] 
$ ls
analysis-ik

# root @ iZ2zedtbewsc8oa9i1cb4tZ in /data/elasticsearch-6.5.4/plugins [18:04:34] 
$ ls -l ./analysis-ik/
total 1432
-rw-r--r-- 1 root root 263965 May  6  2018 commons-codec-1.9.jar
-rw-r--r-- 1 root root  61829 May  6  2018 commons-logging-1.2.jar
drwxr-xr-x 2 root root   4096 Aug 26 17:52 config
-rw-r--r-- 1 root root  54693 Dec 23 11:26 elasticsearch-analysis-ik-6.5.4.jar
-rw-r--r-- 1 root root 736658 May  6  2018 httpclient-4.5.2.jar
-rw-r--r-- 1 root root 326724 May  6  2018 httpcore-4.4.4.jar
-rw-r--r-- 1 root root   1805 Dec 23 11:26 plugin-descriptor.properties
-rw-r--r-- 1 root root    125 Dec 23 11:26 plugin-security.policy
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配置默认分词工具为ik分词,在ElasticSearch的配置文件config/elasticsearch.yml中的最后一行添加参数: index.analysis.analyzer.default.type:ik (则设置全部索引的默认分词器为ik分词,也能够不这么作，经过设置mapping来使用ik分词)

# root @ iZ2zedtbewsc8oa9i1cb4tZ in /data/elasticsearch-6.5.4 [18:33:16] 
$ cd config/

# root @ iZ2zedtbewsc8oa9i1cb4tZ in /data/elasticsearch-6.5.4/config [18:33:21] 
$ echo "index.analysis.analyzer.default.type:ik" >> elasticsearch.yml
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2. 启动eleasticsearch，并测试ik分词

方便测试，以普通模式启动:

./bin/elasticsearch
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建立索引文件:

curl -XPUT http://localhost:9200/class
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使用ik分词，查看效果:

curl -XGET -H "Content-Type: application/json" 'http://localhost:9200/class/_analyze?pretty' -d ' { "analyzer": "ik_max_word", "text": "我是中国人，我爱个人祖国和人民" }'
{
  "tokens" : [
    {
      "token" : "我",
      "start_offset" : 0,
      "end_offset" : 1,
      "type" : "CN_CHAR",
      "position" : 0
    },
    {
      "token" : "是",
      "start_offset" : 1,
      "end_offset" : 2,
      "type" : "CN_CHAR",
      "position" : 1
    },
    {
      "token" : "中国人",
      "start_offset" : 2,
      "end_offset" : 5,
      "type" : "CN_WORD",
      "position" : 2
    },
    {
      "token" : "中国",
      "start_offset" : 2,
      "end_offset" : 4,
      "type" : "CN_WORD",
      "position" : 3
    },
    {
      "token" : "国人",
      "start_offset" : 3,
      "end_offset" : 5,
      "type" : "CN_WORD",
      "position" : 4
    },
    {
      "token" : "我",
      "start_offset" : 6,
      "end_offset" : 7,
      "type" : "CN_CHAR",
      "position" : 5
    },
    {
      "token" : "爱我",
      "start_offset" : 7,
      "end_offset" : 9,
      "type" : "CN_WORD",
      "position" : 6
    },
    {
      "token" : "的",
      "start_offset" : 9,
      "end_offset" : 10,
      "type" : "CN_CHAR",
      "position" : 7
    },
    {
      "token" : "祖国",
      "start_offset" : 10,
      "end_offset" : 12,
      "type" : "CN_WORD",
      "position" : 8
    },
    {
      "token" : "和",
      "start_offset" : 12,
      "end_offset" : 13,
      "type" : "CN_CHAR",
      "position" : 9
    },
    {
      "token" : "人民",
      "start_offset" : 13,
      "end_offset" : 15,
      "type" : "CN_WORD",
      "position" : 10
    }
  ]
}
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3. 测试完成以后以守护进程启动

./data/elasticsearch/bin/elasticsearch  -d
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待续 ......