wikimedia/mediawiki-extensions-CirrusSearch

<?php

namespace CirrusSearch\Search\Rescore;

use Elastica\Query\FunctionScore;

/**
 * Builds a function that boosts incoming links
 * formula is log( incoming_links + 2 )
 */
class IncomingLinksFunctionScoreBuilder implements BoostFunctionBuilder {
    public function append( FunctionScore $functionScore ) {
        $functionScore->addFunction( 'field_value_factor', [
            'field' => 'incoming_links',
            'modifier' => 'log2p',
            'missing' => 0,
        ] );
    }
}