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Elastic Docs ›Elasticsearch Guide [7.1] ›Analysis ›Token Filters

Fingerprint Token Filter

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Fingerprint Token Filter

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The fingerprint token filter emits a single token which is useful for fingerprinting a body of text, and/or providing a token that can be clustered on. It does this by sorting the tokens, deduplicating and then concatenating them back into a single token.

For example, the tokens ["the", "quick", "quick", "brown", "fox", "was", "very", "brown"] will be transformed into a single token: "brown fox quick the very was". Notice how the tokens were sorted alphabetically, and there is only one "quick".

The following are settings that can be set for a fingerprint token filter type:

Setting Description

separator

Defaults to a space.

max_output_size

Defaults to 255.

Maximum token size

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Because a field may have many unique tokens, it is important to set a cutoff so that fields do not grow too large. The max_output_size setting controls this behavior. If the concatenated fingerprint grows larger than max_output_size, the token filter will exit and will not emit a token (e.g. the field will be empty).

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