KeywordType.php

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<?php
declare(strict_types=1);

namespace Magento\Elasticsearch\Elasticsearch5\Model\Adapter\FieldMapper\Product\FieldProvider\FieldType\Resolver;

use Magento\Elasticsearch\Model\Adapter\FieldMapper\Product\AttributeAdapter;
use Magento\Elasticsearch\Model\Adapter\FieldMapper\Product\FieldProvider\FieldType\ConverterInterface;
use Magento\Elasticsearch\Model\Adapter\FieldMapper\Product\FieldProvider\FieldType\ResolverInterface;

class KeywordType implements ResolverInterface
{
    private $fieldTypeConverter;

    public function __construct(ConverterInterface $fieldTypeConverter)
    {
        $this->fieldTypeConverter = $fieldTypeConverter;
    }

    public function getFieldType(AttributeAdapter $attribute): ?string
    {
        if ($attribute->isComplexType()
            || (!$attribute->isSearchable() && !$attribute->isAlwaysIndexable() && $attribute->isFilterable())
        ) {
            return $this->fieldTypeConverter->convert(ConverterInterface::INTERNAL_DATA_TYPE_KEYWORD);
        }

        return null;
    }
}