Wildcard.php

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<?php
namespace Magento\Elasticsearch\SearchAdapter\Filter\Builder;

use Magento\Framework\Search\Request\Filter\Wildcard as WildcardFilterRequest;
use Magento\Framework\Search\Request\FilterInterface as RequestFilterInterface;
use Magento\Elasticsearch\Model\Adapter\FieldMapperInterface;

class Wildcard implements FilterInterface
{
    protected $fieldMapper;

    public function __construct(FieldMapperInterface $fieldMapper)
    {
        $this->fieldMapper = $fieldMapper;
    }

    public function buildFilter(RequestFilterInterface $filter)
    {
        $fieldName = $this->fieldMapper->getFieldName($filter->getField());
        return [
            [
                'wildcard' => [
                    $fieldName => '*' . $filter->getValue() . '*',
                ],
            ]
        ];
    }
}