Apostrophe token filter

Apostrophe token filter

Strips all characters after an apostrophe, including the apostrophe itself.

This filter is included in Elasticsearch’s built-in Turkish language analyzer. It uses Lucene’s ApostropheFilter, which was built for the Turkish language.

Example

The following analyze API request demonstrates how the apostrophe token filter works.

  1. resp = client.indices.analyze(
  2.     tokenizer="standard",
  3.     filter=[
  4.         "apostrophe"
  5.     ],
  6.     text="Istanbul'a veya Istanbul'dan",
  7. )
  8. print(resp)
  1. response = client.indices.analyze(
  2.   body: {
  3.     tokenizer: 'standard',
  4.     filter: [
  5.       'apostrophe'
  6.     ],
  7.     text: "Istanbul'a veya Istanbul'dan"
  8.   }
  9. )
  10. puts response
  1. const response = await client.indices.analyze({
  2.   tokenizer: "standard",
  3.   filter: ["apostrophe"],
  4.   text: "Istanbul'a veya Istanbul'dan",
  5. });
  6. console.log(response);
  1. GET /_analyze
  2. {
  3.   "tokenizer" : "standard",
  4.   "filter" : ["apostrophe"],
  5.   "text" : "Istanbul'a veya Istanbul'dan"
  6. }

The filter produces the following tokens:

  1. [ Istanbul, veya, Istanbul ]

Add to an analyzer

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

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