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Elastic Docs ›Elasticsearch Guide [7.5] ›Text analysis ›Token filter reference

Classic token filter

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Classic token filter

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Performs optional post-processing of terms generated by the classic tokenizer.

This filter removes the english possessive ('s) from the end of words and removes dots from acronyms. It uses Lucene’s ClassicFilter.

Example

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

GET /_analyze
{
  "tokenizer" : "classic",
  "filter" : ["classic"],
  "text" : "The 2 Q.U.I.C.K. Brown-Foxes jumped over the lazy dog's bone."
}

The filter produces the following tokens:

[ The, 2, QUICK, Brown, Foxes, jumped, over, the, lazy, dog, bone ]

Add to an analyzer

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

PUT /classic_example
{
    "settings" : {
        "analysis" : {
            "analyzer" : {
                "classic_analyzer" : {
                    "tokenizer" : "classic",
                    "filter" : ["classic"]
                }
            }
        }
    }
}
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