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You can also boost the percentage relevance that is given to query results by setting up specific field process or by using multipliers. See Manipulate Result Relevance for details on
BIAS and other methods that allow you to manipulate result scores.
BIASDATE field specifier (case sensitive) allows you to boost the score of result documents by a specified percentage, based on how close the date in a specified field is to a specified date.
BIASDISTSPHERICAL field specifier allows you to boost the score of any document according to its distance from a specified point using spherical coordinates (latitude and longitude).
BIASVAL field specifier (case sensitive) allows you to bias the score of result documents by a specified percentage, based on whether they include a specific value in the specified field.