Fatal error: Uncaught Error: Interface 'Magento\Elasticsearch\Model\Adapter\FieldMapperInterface' not found in /home/esecureh/public_html/magdemo/vendor/magento/module-elasticsearch/Elasticsearch5/Model/Adapter/FieldMapper/ProductFieldMapper.php:18 Stack trace: #0 {main} thrown in /home/esecureh/public_html/magdemo/vendor/magento/module-elasticsearch/Elasticsearch5/Model/Adapter/FieldMapper/ProductFieldMapper.php on line 18