RepositoryDomainMapperFactory for additional SearchService with Legacy search engine

RepositoryDomainMapperFactory.php

<?php

namespace ClientName\Bundle\ProjectBundle\ApiLoader;

use eZ\Publish\Core\Base\Container\ApiLoader\FieldTypeCollectionFactory;
use eZ\Publish\Core\Repository\Helper\DomainMapper;
use eZ\Publish\Core\Repository\Helper\FieldTypeRegistry;
use eZ\Publish\SPI\Persistence;
use Symfony\Component\DependencyInjection\ContainerAware;

class RepositoryDomainMapperFactory extends ContainerAware
{
    /**
     * @var \eZ\Publish\SPI\Persistence\Content\Handler
     */
    protected $contentHandler;

    /**
     * @var \eZ\Publish\SPI\Persistence\Content\Location\Handler
     */
    protected $locationHandler;

    /**
     * @var \eZ\Publish\SPI\Persistence\Content\Type\Handler
     */
    protected $contentTypeHandler;

    /**
     * @var \eZ\Publish\SPI\Persistence\Content\Language\Handler
     */
    protected $contentLanguageHandler;

    /**
     * @var \eZ\Publish\Core\Base\Container\ApiLoader\FieldTypeCollectionFactory
     */
    protected $fieldTypeCollectionFactory;

    /**
     * @param \eZ\Publish\SPI\Persistence\Content\Handler $contentHandler
     * @param \eZ\Publish\SPI\Persistence\Content\Location\Handler $locationHandler
     * @param \eZ\Publish\SPI\Persistence\Content\Type\Handler $contentTypeHandler
     * @param \eZ\Publish\SPI\Persistence\Content\Language\Handler $contentLanguageHandler
     * @param \eZ\Publish\Core\Base\Container\ApiLoader\FieldTypeCollectionFactory $fieldTypeCollectionFactory
     */
    public function __construct(
        Persistence\Content\Handler $contentHandler,
        Persistence\Content\Location\Handler $locationHandler,
        Persistence\Content\Type\Handler $contentTypeHandler,
        Persistence\Content\Language\Handler $contentLanguageHandler,
        FieldTypeCollectionFactory $fieldTypeCollectionFactory
    ) {
        $this->contentHandler = $contentHandler;
        $this->locationHandler = $locationHandler;
        $this->contentTypeHandler = $contentTypeHandler;
        $this->contentLanguageHandler = $contentLanguageHandler;
        $this->fieldTypeCollectionFactory = $fieldTypeCollectionFactory;
    }

    /**
     * @return \eZ\Publish\Core\Repository\Helper\DomainMapper
     */
    public function buildService()
    {
        return new DomainMapper(
            $this->contentHandler,
            $this->locationHandler,
            $this->contentTypeHandler,
            $this->contentLanguageHandler,
            new FieldTypeRegistry(
                $this->fieldTypeCollectionFactory->getFieldTypes()
            )
        );
    }
}