Mac安装elasticsearch、ik分词、分词热更新配置

# elasticsearch需要java安装环境
* brew cask install homebrew/cask-versions/adoptopenjdk8

# 安装elasticsearch及启动
* brew install elasticsearch@6.8.0
* brew services start elasticsearch@6.8.0

# 测试是否成功启动（启动后大概五秒后执行）
* curl localhost:9200

```
{
  "name" : "Ja66PI6",
  "cluster_name" : "elasticsearch_xxxx",
  "cluster_uuid" : "HP0FAtbCTtSnpbNvgG9cyQ",
  "version" : {
    "number" : "6.8.0",
    "build_flavor" : "oss",
    "build_type" : "tar",
    "build_hash" : "65b6179",
    "build_date" : "2019-05-15T20:06:13.172855Z",
    "build_snapshot" : false,
    "lucene_version" : "7.7.0",
    "minimum_wire_compatibility_version" : "5.6.0",
    "minimum_index_compatibility_version" : "5.0.0"
  },
  "tagline" : "You Know, for Search"
}
```

# ik分词版本要与elasticsearch版本对应
如果elasticsearch是6.8.0，ik分词也必须是6.8.0

安装ik分词
>  elasticsearch-plugin install https://github.com/medcl/elasticsearch-analysis-ik/releases/download/v6.8.0/elasticsearch-analysis-ik-6.8.0.zip

# 查看状态
* brew services list

# 启动/重启/停止
* brew services start elasticsearch
* brew services restart elasticsearch
* brew services stop elasticsearch

## 测试ik分词
### 创建index索引
* curl -XPUT "http://127.0.0.1:9200/index?pretty"

### 测试是否分词成功
```
curl 'http://localhost:9200/index/_analyze?pretty=true' -H 'Content-Type: application/json' -d '{ "analyzer":"ik_max_word", "text":"这里是好记性不如烂笔头感叹号的博客们"}'
```

## 分词热更新
elasticsearch信息找到Config参数：
> brew info elasticsearch

找到文件
> /usr/local/etc/elasticsearch/analysis-ik/IKAnalyzer.cfg.xml

```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>
	
	<entry key="ext_dict"></entry>
	 
	<entry key="ext_stopwords"></entry>
	
 	
	<entry key="remote_ext_dict">http://xxx.com/xxxxxxx.txt</entry>
 	
	<entry key="remote_ext_stopwords">http://xxx.com/xxx.txt</entry>
</properties>
```

在remote_ext_dict中填入的地址中填写一个txt文本地址，每个词换一行，stop先停止，start在开启（不要用restart！）

**注意：修改了remote_ext_dict中的参数后不要使用brew services restart elasticsearch重启elasticsearch，这样重启不会重新去取远程文件位置，需要先stop后start**

参考文章：
http://blog.51yip.com/server/1892.html

https://blog.csdn.net/github_26672553/article/details/71080286

Mac安装elasticsearch、ik分词、分词热更新配置

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