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Elastic Docs ›Elasticsearch Guide [7.2] ›Analysis ›Tokenizers

Keyword Tokenizer

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Keyword Tokenizer

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The keyword tokenizer is a “noop” tokenizer that accepts whatever text it is given and outputs the exact same text as a single term. It can be combined with token filters to normalise output, e.g. lower-casing email addresses.

Example output

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POST _analyze
{
  "tokenizer": "keyword",
  "text": "New York"
}

The above sentence would produce the following term:

[ New York ]

Configuration

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The keyword tokenizer accepts the following parameters:

buffer_size

The number of characters read into the term buffer in a single pass. Defaults to 256. The term buffer will grow by this size until all the text has been consumed. It is advisable not to change this setting.

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