Smile\ElasticsuiteCatalog\Model\ResourceModel\Product\Fulltext\Collection::prepareSortOrders PHP Method

    private function prepareSortOrders()
    {
        $sortOrders = [];
        $useProductuctLimitation = isset($this->_productLimitationFilters['sortParams']);
        foreach ($this->_orders as $attribute => $direction) {
            $sortParams = ['direction' => $direction];
            if ($useProductuctLimitation && isset($this->_productLimitationFilters['sortParams'][$attribute])) {
                $sortField = $this->_productLimitationFilters['sortParams'][$attribute]['sortField'];
                $sortParams = array_merge($sortParams, $this->_productLimitationFilters['sortParams'][$attribute]);
            } elseif ($attribute == 'price') {
                // Change the price sort field to the nested price field.
                $sortField = 'price.price';
                $sortParams['nestedPath'] = 'price';
                // Ensure we sort on the position field of the current customer group.
                $customerGroupId = $this->_productLimitationFilters['customer_group_id'];
                $sortParams['nestedFilter'] = ['price.customer_group_id' => $customerGroupId];
            }
            $sortField = $this->mapFieldName($attribute);
            $sortOrders[$sortField] = $sortParams;
        }
        return $sortOrders;
    }