Decimal digit token filter

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:

  1. resp = client.indices.analyze(
  2.     tokenizer="whitespace",
  3.     filter=[
  4.         "decimal_digit"
  5.     ],
  6.     text="१-one two-२ ३",
  7. )
  8. print(resp)
  1. response = client.indices.analyze(
  2.   body: {
  3.     tokenizer: 'whitespace',
  4.     filter: [
  5.       'decimal_digit'
  6.     ],
  7.     text: '१-one two-२ ३'
  8.   }
  9. )
  10. puts response
  1. const response = await client.indices.analyze({
  2.   tokenizer: "whitespace",
  3.   filter: ["decimal_digit"],
  4.   text: "१-one two-२ ३",
  5. });
  6. console.log(response);
  1. GET /_analyze
  2. {
  3.   "tokenizer" : "whitespace",
  4.   "filter" : ["decimal_digit"],
  5.   "text" : "१-one two-२ ३"
  6. }

The filter produces the following tokens:

  1. [ 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.

  1. resp = client.indices.create(
  2.     index="decimal_digit_example",
  3.     settings={
  4.         "analysis": {
  5.             "analyzer": {
  6.                 "whitespace_decimal_digit": {
  7.                     "tokenizer": "whitespace",
  8.                     "filter": [
  9.                         "decimal_digit"
  10.                     ]
  11.                 }
  12.             }
  13.         }
  14.     },
  15. )
  16. print(resp)
  1. response = client.indices.create(
  2.   index: 'decimal_digit_example',
  3.   body: {
  4.     settings: {
  5.       analysis: {
  6.         analyzer: {
  7.           whitespace_decimal_digit: {
  8.             tokenizer: 'whitespace',
  9.             filter: [
  10.               'decimal_digit'
  11.             ]
  12.           }
  13.         }
  14.       }
  15.     }
  16.   }
  17. )
  18. puts response
  1. const response = await client.indices.create({
  2.   index: "decimal_digit_example",
  3.   settings: {
  4.     analysis: {
  5.       analyzer: {
  6.         whitespace_decimal_digit: {
  7.           tokenizer: "whitespace",
  8.           filter: ["decimal_digit"],
  9.         },
  10.       },
  11.     },
  12.   },
  13. });
  14. console.log(response);
  1. PUT /decimal_digit_example
  2. {
  3.   "settings": {
  4.     "analysis": {
  5.       "analyzer": {
  6.         "whitespace_decimal_digit": {
  7.           "tokenizer": "whitespace",
  8.           "filter": [ "decimal_digit" ]
  9.         }
  10.       }
  11.     }
  12.   }
  13. }