[BUGFIX:BP:11.5] changed from always picking the 0 array value to pic…

…k always the first.

Ports: #3068

Classes/Controller/Backend/Search/AbstractModuleController.php

@@ -384,7 +384,7 @@ private function initializeFirstAvailableSolrCoreConnection(array $solrCoreConne
         if (empty($solrCoreConnections)) {
             return;
         }
-        $this->selectedSolrCoreConnection = $solrCoreConnections[0];
+        $this->selectedSolrCoreConnection = array_shift($solrCoreConnections);
         $moduleData->setCore($this->selectedSolrCoreConnection->getAdminService()->getCorePath());
         $this->moduleDataStorageService->persistModuleData($moduleData);
     }