phpMyFAQ Fatal error

Uncaught exception: 'TypeError'

Message: 'phpMyFAQ\Configuration::getElasticsearch(): Return value must be of type Elastic\Elasticsearch\Client, null returned'

Stack trace:

#0 /app/src/phpMyFAQ/Search/Elasticsearch.php(50): phpMyFAQ\Configuration->getElasticsearch()
#1 /app/src/phpMyFAQ/Search.php(188): phpMyFAQ\Search\Elasticsearch->__construct(Object(phpMyFAQ\Configuration))
#2 /app/src/phpMyFAQ/Search.php(82): phpMyFAQ\Search->searchElasticsearch('bonjour', false)
#3 /app/search.php(165): phpMyFAQ\Search->search('bonjour', false)
#4 /app/index.php(793): require('/app/search.php')
#5 {main}

Thrown in '/app/src/phpMyFAQ/Configuration.php' on line 338