【DSL】Elasticsearch之Analyze(分析過程)

_analyze是Elasticsearch一個非常有用的API，它可以幫助你分析每一個field或者某個analyzer/tokenizer是如何分析和索引一段文字。

返回結果欄位含義：
token是一個實際被儲存在索引中的詞
position指明詞在原文字中是第幾個出現的
start_offset和end_offset表示詞在原文字中佔據的位置。
1、預設analyzer
GET /_analyze?
{"analyzer" : "standard",  "text" : "床前明月光"}
{
  "tokens": [
    {
      "token": "床",
      "start_offset": 0,
      "end_offset": 1,
      "type": "<IDEOGRAPHIC>",
      "position": 0
    },
    {
      "token": "前",
      "start_offset": 1,
      "end_offset": 2,
      "type": "<IDEOGRAPHIC>",
      "position": 1
    },
    {
      "token": "明",
      "start_offset": 2,
      "end_offset": 3,
      "type": "<IDEOGRAPHIC>",
      "position": 2
    },
    {
      "token": "月",
      "start_offset": 3,
      "end_offset": 4,
      "type": "<IDEOGRAPHIC>",
      "position": 3
    },
    {
      "token": "光",
      "start_offset": 4,
      "end_offset": 5,
      "type": "<IDEOGRAPHIC>",
      "position": 4
    }
  ]
}
2、也可以用指定的analyzer來分析使用whitspace
GET /_analyze?
{
  "analyzer" : "whitespace",
  "text" : "床前 明月光"
}

{
  "tokens": [
    {
      "token": "床前",
      "start_offset": 0,
      "end_offset": 2,
      "type": "word",
      "position": 0
    },
    {
      "token": "明月光",
      "start_offset": 3,
      "end_offset": 6,
      "type": "word",
      "position": 1
    }
  ]
}
3、使用ik分析器
GET /tystock/_analyze?
{
  "analyzer": "ik_max_word",
  "text" : "床前明月光"
}
{
  "tokens": [
    {
      "token": "床前明月光",
      "start_offset": 0,
      "end_offset": 5,
      "type": "CN_WORD",
      "position": 0
    },
    {
      "token": "床前",
      "start_offset": 0,
      "end_offset": 2,
      "type": "CN_WORD",
      "position": 1
    },
    {
      "token": "明月光",
      "start_offset": 2,
      "end_offset": 5,
      "type": "CN_WORD",
      "position": 2
    },
    {
      "token": "明月",
      "start_offset": 2,
      "end_offset": 4,
      "type": "CN_WORD",
      "position": 3
    },
    {
      "token": "明",
      "start_offset": 2,
      "end_offset": 3,
      "type": "CN_WORD",
      "position": 4
    },
    {
      "token": "月光",
      "start_offset": 3,
      "end_offset": 5,
      "type": "CN_WORD",
      "position": 5
    },
    {
      "token": "月",
      "start_offset": 3,
      "end_offset": 4,
      "type": "CN_WORD",
      "position": 6
    },
    {
      "token": "光",
      "start_offset": 4,
      "end_offset": 5,
      "type": "CN_CHAR",
      "position": 7
    }
  ]
}
4、使用拼音分析器
GET /tystock/_analyze?
{
  "analyzer": "pinyin",
  "text" : "床前明月光"
}
{
  "tokens": [
    {
      "token": "chuang",
      "start_offset": 0,
      "end_offset": 1,
      "type": "word",
      "position": 0
    },
    {
      "token": "cqmyg",
      "start_offset": 0,
      "end_offset": 5,
      "type": "word",
      "position": 0
    },
    {
      "token": "qian",
      "start_offset": 1,
      "end_offset": 2,
      "type": "word",
      "position": 1
    },
    {
      "token": "ming",
      "start_offset": 2,
      "end_offset": 3,
      "type": "word",
      "position": 2
    },
    {
      "token": "yue",
      "start_offset": 3,
      "end_offset": 4,
      "type": "word",
      "position": 3
    },
    {
      "token": "guang",
      "start_offset": 4,
      "end_offset": 5,
      "type": "word",
      "position": 4
    }
  ]
}
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懶得整理，直接粘來留存一下
作者：飛飛好奇 
來源：CSDN 
原文：https://blog.csdn.net/xf_87/article/details/79402489