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Elastic Docs ›Elasticsearch Guide [7.16] ›Text analysis ›Token filter reference

Apostrophe token filter

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Apostrophe token filter

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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

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

GET /_analyze
{
  "tokenizer" : "standard",
  "filter" : ["apostrophe"],
  "text" : "Istanbul'a veya Istanbul'dan"
}

The filter produces the following tokens:

[ Istanbul, veya, Istanbul ]

Add to an analyzer

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

PUT /apostrophe_example
{
  "settings": {
    "analysis": {
      "analyzer": {
        "standard_apostrophe": {
          "tokenizer": "standard",
          "filter": [ "apostrophe" ]
        }
      }
    }
  }
}
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