1、下载
https://github.com/medcl/elasticsearch-analysis-ik/releases?after=v7.2.0
查找对应版本下载
我们下载6.8.2的
wget https://github.com/medcl/elasticsearch-analysis-ik/releases/download/v6.8.2/elasticsearch-analysis-ik-6.8.2.zip
2、解压下载到plugins目录下并解压
unzip elasticsearch-analysis-ik-6.8.2.zip
mv elasticsearch-analysis-ik-6.8.2 ik
3、安装完毕并重启启动es
jps
21660 Elasticsearch
kill -9 21660
./bin/elasticsearch -d
4、使用ik分词
IK分词的原理与测试
IK 的 ik_smart 和 ik_max_word 两种分词策略

默认分词

GET _analyze
{
  "text": "共和国国歌"
}

结果

{
  "tokens" : [
    {
      "token" : "共",
      "start_offset" : 0,
      "end_offset" : 1,
      "type" : "<IDEOGRAPHIC>",
      "position" : 0
    },
    {
      "token" : "和",
      "start_offset" : 1,
      "end_offset" : 2,
      "type" : "<IDEOGRAPHIC>",
      "position" : 1
    },
    {
      "token" : "国",
      "start_offset" : 2,
      "end_offset" : 3,
      "type" : "<IDEOGRAPHIC>",
      "position" : 2
    },
    {
      "token" : "国",
      "start_offset" : 3,
      "end_offset" : 4,
      "type" : "<IDEOGRAPHIC>",
      "position" : 3
    },
    {
      "token" : "歌",
      "start_offset" : 4,
      "end_offset" : 5,
      "type" : "<IDEOGRAPHIC>",
      "position" : 4
    }
  ]
}

ik_smart 分词

GET _analyze 
{ 
 "analyzer":"ik_smart", 
 "text":"中华人民共和国中央人民政府万岁"
}

结果

{
  "tokens" : [
    {
      "token" : "中华人民共和国",
      "start_offset" : 0,
      "end_offset" : 7,
      "type" : "CN_WORD",
      "position" : 0
    },
    {
      "token" : "中央人民政府",
      "start_offset" : 7,
      "end_offset" : 13,
      "type" : "CN_WORD",
      "position" : 1
    },
    {
      "token" : "万岁",
      "start_offset" : 13,
      "end_offset" : 15,
      "type" : "CN_WORD",
      "position" : 2
    }
  ]
}

ik_max_word分词

GET _analyze 
{ 
 "analyzer":"ik_max_word", 
 "text":"中华人民共和国中央人民政府万岁"
}

结果

{
  "tokens" : [
    {
      "token" : "中华人民共和国",
      "start_offset" : 0,
      "end_offset" : 7,
      "type" : "CN_WORD",
      "position" : 0
    },
    {
      "token" : "中华人民",
      "start_offset" : 0,
      "end_offset" : 4,
      "type" : "CN_WORD",
      "position" : 1
    },
    {
      "token" : "中华",
      "start_offset" : 0,
      "end_offset" : 2,
      "type" : "CN_WORD",
      "position" : 2
    },
    {
      "token" : "华人",
      "start_offset" : 1,
      "end_offset" : 3,
      "type" : "CN_WORD",
      "position" : 3
    },
    {
      "token" : "人民共和国",
      "start_offset" : 2,
      "end_offset" : 7,
      "type" : "CN_WORD",
      "position" : 4
    },
    {
      "token" : "人民",
      "start_offset" : 2,
      "end_offset" : 4,
      "type" : "CN_WORD",
      "position" : 5
    },
    {
      "token" : "共和国",
      "start_offset" : 4,
      "end_offset" : 7,
      "type" : "CN_WORD",
      "position" : 6
    },
    {
      "token" : "共和",
      "start_offset" : 4,
      "end_offset" : 6,
      "type" : "CN_WORD",
      "position" : 7
    },
    {
      "token" : "国中",
      "start_offset" : 6,
      "end_offset" : 8,
      "type" : "CN_WORD",
      "position" : 8
    },
    {
      "token" : "国",
      "start_offset" : 6,
      "end_offset" : 7,
      "type" : "CN_CHAR",
      "position" : 9
    },
    {
      "token" : "中央人民政府",
      "start_offset" : 7,
      "end_offset" : 13,
      "type" : "CN_WORD",
      "position" : 10
    },
    {
      "token" : "中央",
      "start_offset" : 7,
      "end_offset" : 9,
      "type" : "CN_WORD",
      "position" : 11
    },
    {
      "token" : "人民政府",
      "start_offset" : 9,
      "end_offset" : 13,
      "type" : "CN_WORD",
      "position" : 12
    },
    {
      "token" : "人民",
      "start_offset" : 9,
      "end_offset" : 11,
      "type" : "CN_WORD",
      "position" : 13
    },
    {
      "token" : "民政",
      "start_offset" : 10,
      "end_offset" : 12,
      "type" : "CN_WORD",
      "position" : 14
    },
    {
      "token" : "政府",
      "start_offset" : 11,
      "end_offset" : 13,
      "type" : "CN_WORD",
      "position" : 15
    },
    {
      "token" : "万岁",
      "start_offset" : 13,
      "end_offset" : 15,
      "type" : "CN_WORD",
      "position" : 16
    },
    {
      "token" : "万",
      "start_offset" : 13,
      "end_offset" : 14,
      "type" : "TYPE_CNUM",
      "position" : 17
    },
    {
      "token" : "岁",
      "start_offset" : 14,
      "end_offset" : 15,
      "type" : "COUNT",
      "position" : 18
    }
  ]
}