# Fingerprint Analyzer（指纹分析器）

fingerprint 分析器实现了OpenRefine项目使用的[指纹识别算法](https://github.com/OpenRefine/OpenRefine/wiki/Clustering-In-Depth#fingerprint)来协助聚类。

输入文本较低，规范化以删除扩展字符，排序，重复数据删除并连接到单个令牌。 如果配置了一个停用词列表，停止单词也将被删除。

## **定义**

它包括：

分词器

* [Standard Tokenizer](https://www.elastic.co/guide/en/elasticsearch/reference/5.3/analysis-standard-tokenizer.html)

词语过滤器

* [Lower Case Token Filter](https://www.elastic.co/guide/en/elasticsearch/reference/5.3/analysis-lowercase-tokenfilter.html)
* [ASCII Folding Token Filter](https://www.elastic.co/guide/en/elasticsearch/reference/5.3/analysis-asciifolding-tokenfilter.html)
* [Stop Token Filter](https://www.elastic.co/guide/en/elasticsearch/reference/5.3/analysis-stop-tokenfilter.html) (默认禁用)
* [Fingerprint Token Filter](https://www.elastic.co/guide/en/elasticsearch/reference/5.3/analysis-fingerprint-tokenfilter.html)

## **输出实例**

```
POST _analyze
{
  "analyzer": "fingerprint",
  "text": "Yes yes, Gödel said this sentence is consistent and."
}
```

上述的句子将产生以下的词语：

```
[ and consistent godel is said sentence this yes ]
```

## **配置**

```
fingerprint（指纹）分析器接受以下的参数：
```

| `separator`       | 用于连接条款的字符。 默认为空格。                                |
| ----------------- | ------------------------------------------------ |
| `max_output_size` | 要发出的最大标记大小。 默认为255.大于此大小的token将被丢弃。              |
| `stopwords`       | 预定义的停止词列表，如\_english\_或包含停止词列表的数组。 默认为 \_none\_。 |
| `stopwords_path`  | 包含停止词的文件的路径。                                     |

有关停止字配置的更多信息，请参阅[Stop Token Filter](https://www.elastic.co/guide/en/elasticsearch/reference/5.3/analysis-stop-tokenfilter.html)。

## **配置实例**

在这个例子中，我们配置 fingerprint 分析器以使用预定义的英文停止词列表：

```
PUT my_index
{
  "settings": {
    "analysis": {
      "analyzer": {
        "my_fingerprint_analyzer": {
          "type": "fingerprint",
          "stopwords": "_english_"
        }
      }
    }
  }
}

POST my_index/_analyze
{
  "analyzer": "my_fingerprint_analyzer",
  "text": "Yes yes, Gödel said this sentence is consistent and."
}
```

以上示例产生以下词语：

```
[ consistent godel said sentence yes ]
```


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