elasticsearch_feeder.php

    private function feedData(): void
    {
        $productFile = new \SplFileObject($this->productFilePath);
        $productFile->fgetcsv();//ignore headline

        while ($data = $productFile->fgetcsv()) {
            list($rowIdx, $title, $price, $retailer, $rating, $desc) = $data;
            $doc = array_merge(
                $this->indexDefinition,
                [
                    'id' => $rowIdx,
                    'body' => [
                        'title' => $title,
                        'price' => (float)$price,
                        'retailer' => $retailer,
                        'rating' => (float)$rating,
                        'desc' => $desc
                    ]
                ]
            );
            $this->client->index($doc);
        }
    }