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Elastic Docs ›Elasticsearch Guide [7.7] ›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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