master_not_discovered_exception results in the following fatal error:

[JTubex]

Summary of problem

master_not_discovered_exception results in the following fatal error:

Error: Wrong parameters for Elasticsearch\Common\Exceptions\ServerErrorResponseException([string $message [, long $code [, Throwable $previous = NULL]]]) in Exception->__construct() (line 704 of /vagrant/htdocs/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Connections/Connection.php).
Exception->__construct(Array, 503, Object) (Line: 704)
Elasticsearch\Connections\Connection->tryDeserializeError(Array, 'Elasticsearch\Common\Exceptions\ServerErrorResponseException') (Line: 675)
Elasticsearch\Connections\Connection->tryDeserialize500Error(Array) (Line: 643)
Elasticsearch\Connections\Connection->process5xxError(Array, Array, Array) (Line: 315)
Elasticsearch\Connections\Connection->Elasticsearch\Connections\{closure}(Array) (Line: 25)
React\Promise\FulfilledPromise->then(Object, NULL, NULL) (Line: 55)
GuzzleHttp\Ring\Future\CompletedFutureValue->then(Object, NULL, NULL) (Line: 341)
GuzzleHttp\Ring\Core::proxy(Object, Object) (Line: 324)
Elasticsearch\Connections\Connection->Elasticsearch\Connections\{closure}(Array, Object, Object, Array) (Line: 222)
Elasticsearch\Connections\Connection->performRequest('GET', '/_cluster/health', Array, NULL, Array, Object) (Line: 105)
Elasticsearch\Transport->performRequest('GET', '/_cluster/health', Array, NULL, Array) (Line: 58)
Elasticsearch\Namespaces\AbstractNamespace->performRequest(Object) (Line: 87)
Elasticsearch\Namespaces\ClusterNamespace->health() (Line: 112)
nodespark\DESConnector\Client->isClusterOk() (Line: 149)
Drupal\elasticsearch_connector\Controller\ClusterListBuilder->buildRow(Object) (Line: 262)
Drupal\elasticsearch_connector\Controller\ClusterListBuilder->render() (Line: 23)
Drupal\Core\Entity\Controller\EntityListController->listing('elasticsearch_cluster')
call_user_func_array(Array, Array) (Line: 123)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 573)
Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 124)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) (Line: 97)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 151)
Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 68)
Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 57)
Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 106)
Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) (Line: 85)
Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 52)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23)
Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 694)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)

Code snippet of problem

Problem occurs in Elasticsearch\Connections\Connection::tryDeserializeError().

a print_r of the $response variable:

Array ( [transfer_stats] => Array ( [url] => http://localhost/_cluster/health [content_type] => application/json; charset=UTF-8 [http_code] => 503 [header_size] => 104 [request_size] => 215 [filetime] => -1 [ssl_verify_result] => 0 [redirect_count] => 0 [total_time] => 30.010349 [namelookup_time] => 0.004242 [connect_time] => 0.004286 [pretransfer_time] => 0.004303 [size_upload] => 0 [size_download] => 151 [speed_download] => 5 [speed_upload] => 0 [download_content_length] => 151 [upload_content_length] => -1 [starttransfer_time] => 30.010292 [redirect_time] => 0 [redirect_url] => [primary_ip] => ::1 [certinfo] => Array ( ) [primary_port] => 9200 [local_ip] => ::1 [local_port] => 37072 [http_version] => 2 [protocol] => 1 [ssl_verifyresult] => 0 [scheme] => HTTP [error] => [errno] => 0 ) [curl] => Array ( [error] => [errno] => 0 ) [effective_url] => http://localhost/_cluster/health [headers] => Array ( [content-type] => Array ( [0] => application/json; charset=UTF-8 ) [content-length] => Array ( [0] => 151 ) ) [version] => 1.1 [status] => 503 [reason] => Service Unavailable [body] => {"error":{"root_cause":[{"type":"master_not_discovered_exception","reason":null}],"type":"master_not_discovered_exception","reason":null},"status":503} )

After $error = $this->serializer->deserialize($response['body'], $response['transfer_stats']);

this results in the following $error variable:
Array ( [error] => Array ( [root_cause] => Array ( [0] => Array ( [type] => master_not_discovered_exception [reason] => ) ) [type] => master_not_discovered_exception [reason] => ) [status] => 503 )

System details

• Operating System: Debian 9 (Vagrant)
• PHP Version: 7.3.11
• ES-PHP client version: 7.4.1
• Elasticsearch version: 7.4.2