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**Supported function named parameters**

`output_format`
:   (keyword) The output format of the categories. Defaults to regex.

`similarity_threshold`
:   (integer) The minimum percentage of token weight that must match for text to be added to the category bucket. Must be between 1 and 100. The larger the value the narrower the categories. Larger values will increase memory usage and create narrower categories. Defaults to 70.

`analyzer`
:   (keyword) Analyzer used to convert the field into tokens for text categorization.