elasticsearch - 如何在ElasticSearch中标记罗马数字术语？

Question

通过以下方式注册 token 字符来创建 token 化程序时，无法注册罗马字母“X”。(测试ES版本:ES6.7，ES5.6)

      "tokenizer": {
        "autocomplete": {
          "type": "edge_ngram",
          "min_gram": 1,
          "max_gram": 14,
          "token_chars": [
            "Ⅹ"
          ]
        }
    }

错误日志是这样的

{"error":{"root_cause":[{"type":"remote_transport_exception","reason":"[node02][192.168.115.x:9300][indices:admin/create]"}],"type":"illegal_argument_exception","reason":"Unknown token type: 'ⅹ', must be one of [symbol, private_use, paragraph_separator, start_punctuation, unassigned, enclosing_mark, connector_punctuation, letter_number, other_number, math_symbol, lowercase_letter, space_separator, surrogate, initial_quote_punctuation, decimal_digit_number, digit, other_punctuation, dash_punctuation, currency_symbol, non_spacing_mark, format, modifier_letter, control, uppercase_letter, other_symbol, end_punctuation, modifier_symbol, other_letter, line_separator, titlecase_letter, letter, punctuation, combining_spacing_mark, final_quote_punctuation, whitespace]"},"status":400}

如何将罗马数字标记为术语？

Answer 1

错误消息明确指出您的罗马X不是有效的token type。该错误消息还列出了token type的有效选项，如下所示:

must be one of [symbol, private_use, paragraph_separator, start_punctuation, unassigned, enclosing_mark, connector_punctuation, letter_number, other_number, math_symbol, lowercase_letter, space_separator, surrogate, initial_quote_punctuation, decimal_digit_number, digit, other_punctuation, dash_punctuation, currency_symbol, non_spacing_mark, format, modifier_letter, control, uppercase_letter, other_symbol, end_punctuation, modifier_symbol, other_letter, line_separator, titlecase_letter, letter, punctuation, combining_spacing_mark, final_quote_punctuation, whitespace]

如果您将官方ES文档doct https://www.elastic.co/guide/en/elasticsearch/reference/current/analysis-edgengram-tokenizer.html用作 token 字符，则语法就存在问题，您可以理解其含义，如下所述:

Character classes that should be included in a token. Elasticsearch will split on characters that don’t belong to the classes specified. Defaults to [] (keep all characters).

在其下面再次将有效值指定为digit，letter，同样的链接也提供了一些示例，其中他们将token_chars与有效值一起使用。

如果在分析器设置中将X替换为letter，则可以解决您的问题。