ScoreBuilder.php

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<?php
namespace Magento\Framework\Search\Adapter\Mysql;

class ScoreBuilder
{
    private $scoreCondition = '';

    const WEIGHT_FIELD = 'search_weight';

    public function getScoreAlias()
    {
        return 'score';
    }

    public function build()
    {
        $scoreCondition = $this->scoreCondition;
        $this->clear();
        $scoreAlias = $this->getScoreAlias();

        return "({$scoreCondition}) AS {$scoreAlias}";
    }

    public function startQuery()
    {
        $this->addPlus();
        $this->scoreCondition .= '(';
    }

    public function endQuery($boost)
    {
        if (!empty($this->scoreCondition) && substr($this->scoreCondition, -1) !== '(') {
            $this->scoreCondition .= ") * {$boost}";
        } else {
            $this->scoreCondition .= '0)';
        }
    }

    public function addCondition($score, $useWeights = true)
    {
        $this->addPlus();
        $condition = "{$score}";
        if ($useWeights) {
            $condition = "LEAST(($condition), 1000000) * POW(2, " . self::WEIGHT_FIELD . ')';
        }
        $this->scoreCondition .= $condition;
    }

    private function addPlus()
    {
        if (!empty($this->scoreCondition) && substr($this->scoreCondition, -1) !== '(') {
            $this->scoreCondition .= ' + ';
        }
    }

    private function clear()
    {
        $this->scoreCondition = '';
    }
}