Fulltext.php

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<?php
namespace Magento\Framework\DB\Helper\Mysql;

use Magento\Framework\App\ResourceConnection;

class Fulltext
{
    const FULLTEXT_MODE_NATURAL = 'IN NATURAL LANGUAGE MODE';

    const FULLTEXT_MODE_NATURAL_QUERY = 'IN NATURAL LANGUAGE MODE WITH QUERY EXPANSION';

    const FULLTEXT_MODE_BOOLEAN = 'IN BOOLEAN MODE';

    const FULLTEXT_MODE_QUERY = 'WITH QUERY EXPANSION';

    const MATCH = 'MATCH';

    const AGAINST = 'AGAINST';

    private $connection;

    public function __construct(ResourceConnection $resource)
    {
        $this->connection = $resource->getConnection();
    }

    public function getMatchQuery($columns, $expression, $mode = self::FULLTEXT_MODE_NATURAL)
    {
        if (is_array($columns)) {
            $columns = implode(', ', $columns);
        }

        $expression = $this->connection->quote($expression);

        $condition = self::MATCH . " ({$columns}) " . self::AGAINST . " ({$expression} {$mode})";
        return $condition;
    }

    public function match($select, $columns, $expression, $isCondition = true, $mode = self::FULLTEXT_MODE_NATURAL)
    {
        $fullCondition = $this->getMatchQuery($columns, $expression, $mode);

        if ($isCondition) {
            $select->where($fullCondition);
        } else {
            $select->orWhere($fullCondition);
        }

        return $select;
    }
}