Converter.php

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<?php
namespace Magento\Framework\Search\Request\Config;

class Converter implements \Magento\Framework\Config\ConverterInterface
{
    public function convert($source)
    {
        $requestNodes = $source->getElementsByTagName('request');
        $requests = [];
        foreach ($requestNodes as $requestNode) {
            $simpleXmlNode = simplexml_import_dom($requestNode);
            $name = $requestNode->getAttribute('query');
            $request = $this->mergeAttributes((array)$simpleXmlNode);
            $request['dimensions'] = $this->convertNodes($simpleXmlNode->dimensions, 'name');
            $request['queries'] = $this->convertNodes($simpleXmlNode->queries, 'name');
            $request['filters'] = $this->convertNodes($simpleXmlNode->filters, 'name');
            $request['aggregations'] = $this->convertNodes($simpleXmlNode->aggregations, 'name');
            $requests[$name] = $request;
        }
        return $requests;
    }

    protected function mergeAttributes($data)
    {
        if (isset($data['@attributes'])) {
            $data = array_merge($data, $data['@attributes']);
            unset($data['@attributes']);
        }
        return $data;
    }

    protected function convertNodes(\SimpleXMLElement $nodes, $name)
    {
        $list = [];
        if (!empty($nodes)) {
            foreach ($nodes->children() as $node) {
                $element = $this->convertToArray($node->attributes());
                if ($node->count() > 0) {
                    $element = $this->convertChildNodes($element, $node);
                }
                $type = (string)$node->attributes('xsi', true)['type'];
                if (!empty($type)) {
                    $element['type'] = $type;
                }

                $list[$element[$name]] = $element;
            }
        }
        return $list;
    }

    protected function convertToArray(\SimpleXMLElement $node)
    {
        return $this->mergeAttributes(json_decode(json_encode($node), true));
    }

    protected function convertChildNodes(array $element, \SimpleXMLElement $node)
    {
        if ($node->count() == 0) {
            $element[$node->getName()][] = $this->convertToArray($node);
        } else {
            foreach ($node->children() as $child) {
                $element = $this->convertChildNodes($element, $child);
            }
        }
        return $element;
    }
}