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。希望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，配置完成之后可以设置默认的分词工具，也可以在创建索引文件时使用ik分词工具
1. elasticsearch-ik分词环境必须跟elasticsearch一致
我的elasticsearch版本是elasticsearch-v6.5.4，所以需要下载的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 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进入到plugin目录，创建文件夹
mkdir analysis-ik/ 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
(则设置所有索引的默认分词器为ik分词,也可以不这么做，通过设置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.yml2. 启动eleasticsearch，并测试ik分词
方便测试，以普通模式启动:
./bin/elasticsearch创建索引文件:
curl -XPUT http://localhost:9200/class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，我爱我的祖国和人民"
}'
{
"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
}
]
}3. 测试完成之后以守护进程启动
./data/elasticsearch/bin/elasticsearch -d待续 ......