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测试分析器

analyze API 是查看分析器所生成词项的宝贵工具。可以在请求中以内联方式指定内置分析器。

				POST _analyze
					{
  "analyzer": "whitespace",
  "text":     "The quick brown fox."
}
		

API 返回以下响应

{
  "tokens": [
    {
      "token": "The",
      "start_offset": 0,
      "end_offset": 3,
      "type": "word",
      "position": 0
    },
    {
      "token": "quick",
      "start_offset": 4,
      "end_offset": 9,
      "type": "word",
      "position": 1
    },
    {
      "token": "brown",
      "start_offset": 10,
      "end_offset": 15,
      "type": "word",
      "position": 2
    },
    {
      "token": "fox.",
      "start_offset": 16,
      "end_offset": 20,
      "type": "word",
      "position": 3
    }
  ]
}
		

你也可以测试以下内容的组合:

  • 分词器
  • 零个或多个词元过滤器
  • 零个或多个字符过滤器
				POST _analyze
					{
  "tokenizer": "standard",
  "filter":  [ "lowercase", "asciifolding" ],
  "text":      "Is this déja vu?"
}
		

API 返回以下响应

{
  "tokens": [
    {
      "token": "is",
      "start_offset": 0,
      "end_offset": 2,
      "type": "<ALPHANUM>",
      "position": 0
    },
    {
      "token": "this",
      "start_offset": 3,
      "end_offset": 7,
      "type": "<ALPHANUM>",
      "position": 1
    },
    {
      "token": "deja",
      "start_offset": 8,
      "end_offset": 12,
      "type": "<ALPHANUM>",
      "position": 2
    },
    {
      "token": "vu",
      "start_offset": 13,
      "end_offset": 15,
      "type": "<ALPHANUM>",
      "position": 3
    }
  ]
}
		
位置和字符偏移量

analyze API 的输出中可以看到,分析器不仅将单词转换为词项,还会记录每个词项的顺序或相对 位置(用于短语查询或词语邻近查询),以及每个词项在原始文本中的起始和结束 字符偏移量(用于高亮显示搜索片段)。

或者,在对特定索引运行 analyze API 时,可以引用 custom(自定义)分析器

				PUT my-index-000001
					{
  "settings": {
    "analysis": {
      "analyzer": {
        "std_folded": {
          "type": "custom",
          "tokenizer": "standard",
          "filter": [
            "lowercase",
            "asciifolding"
          ]
        }
      }
    }
  },
  "mappings": {
    "properties": {
      "my_text": {
        "type": "text",
        "analyzer": "std_folded"
      }
    }
  }
}
				GET my-index-000001/_analyze
					{
  "analyzer": "std_folded",
  "text":     "Is this déjà vu?"
}
				GET my-index-000001/_analyze
					{
  "field": "my_text",
  "text":  "Is this déjà vu?"
}
		
  1. 定义一个名为 std_foldedcustom 分析器。
  2. 字段 my_text 使用 std_folded 分析器。
  3. 要引用此分析器,analyze API 必须指定索引名称。
  4. 按名称引用分析器。
  5. 引用字段 my_text 使用的分析器。

API 返回以下响应

{
  "tokens": [
    {
      "token": "is",
      "start_offset": 0,
      "end_offset": 2,
      "type": "<ALPHANUM>",
      "position": 0
    },
    {
      "token": "this",
      "start_offset": 3,
      "end_offset": 7,
      "type": "<ALPHANUM>",
      "position": 1
    },
    {
      "token": "deja",
      "start_offset": 8,
      "end_offset": 12,
      "type": "<ALPHANUM>",
      "position": 2
    },
    {
      "token": "vu",
      "start_offset": 13,
      "end_offset": 15,
      "type": "<ALPHANUM>",
      "position": 3
    }
  ]
}
		
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