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.

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 ]

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" ]
        }
      }
    }
  }
}