Autocomplete.php

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<?php
namespace Magento\Search\Model;

class Autocomplete implements AutocompleteInterface
{
    private $dataProviders;

    public function __construct(
        array $dataProviders
    ) {
        $this->dataProviders = $dataProviders;
        ksort($this->dataProviders);
    }

    public function getItems()
    {
        $data = [];
        foreach ($this->dataProviders as $dataProvider) {
            $data = array_merge($data, $dataProvider->getItems());
        }

        return $data;
    }
}