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Decimal digit token filter

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Decimal digit token filter

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Converts all digits in the Unicode Decimal_Number General Category to 0-9. For example, the filter changes the Bengali numeral ৩ to 3.

This filter uses Lucene’s DecimalDigitFilter.

Example

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The following analyze API request uses the decimal_digit filter to convert Devanagari numerals to 0-9:

response = client.indices.analyze(
  body: {
    tokenizer: 'whitespace',
    filter: [
      'decimal_digit'
    ],
    text: '१-one two-२ ३'
  }
)
puts response

GET /_analyze
{
  "tokenizer" : "whitespace",
  "filter" : ["decimal_digit"],
  "text" : "१-one two-२ ३"
}

The filter produces the following tokens:

[ 1-one, two-2, 3]

Add to an analyzer

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The following create index API request uses the decimal_digit filter to configure a new custom analyzer.

response = client.indices.create(
  index: 'decimal_digit_example',
  body: {
    settings: {
      analysis: {
        analyzer: {
          whitespace_decimal_digit: {
            tokenizer: 'whitespace',
            filter: [
              'decimal_digit'
            ]
          }
        }
      }
    }
  }
)
puts response

PUT /decimal_digit_example
{
  "settings": {
    "analysis": {
      "analyzer": {
        "whitespace_decimal_digit": {
          "tokenizer": "whitespace",
          "filter": [ "decimal_digit" ]
        }
      }
    }
  }
}

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