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Decimal digit token filter

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

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

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

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

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

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https://www.elastic.co/guide/en/elasticsearch/reference/7.17/analysis-decimal-digit-tokenfilter.html