I am trying to create a drush command to run a batch process. When I run the command, the batch runs just once, and I get this error :

in Drupalsearch_api_solrSolrConnectorSolrConnectorPluginBase->handleHttpException() (line 1026 of /var/www/html/web/modules/contrib/search_api_solr/src/SolrConnector/SolrConnectorPluginBase.php). Drupalsearch_api_solrSearchApiSolrException: Solr endpoint http://solr:8983/ not found (code: 404

This is my code, am I doing something wrong? Thanks for your help:

class Drush9CustomCommands extends DrushCommands {    use StringTranslationTrait;   private $entityTypeManager;   protected $logger;   protected $batchService;      public function __construct(EntityTypeManagerInterface $entityTypeManager, LoggerInterface $logger, BatchService $batch_service) {     parent::__construct();     $this->entityTypeManager = $entityTypeManager;     $this->logger = $logger;     $this->batchService = $batch_service;   }    /**    * Update Node.    *    * @command update:node    * @aliases update-node    *    * @usage update:node foo    *   foo is the type of node to update    */   public function updateNode() {      $batch = array(       'title' => t('Exporting'),       'operations' => array(         array([$this->batchService,'processMyNode'], array()),       ),       'finished' => [$this->batchService,'processMyNodeFinished'],     );     batch_set($batch);      drush_backend_batch_process();   } } 

Batchservice.php

class BatchService implements ContainerInjectionInterface {    use StringTranslationTrait;   protected $messenger;    public function __construct(MessengerInterface $messenger) {     $this->messenger = $messenger;   }    /**    * {@inheritDoc}    */   public static function create(ContainerInterface $container) {     return new static(       $container->get('messenger')     );   }    /**    * Batch process callback.    *    * @param int $id    *   Id of the batch.    * @param string $operation_details    *   Details of the operation.    * @param object $context    *   Context for operations.    */   public function processMyNode( &$context) {     if (!isset($context['sandbox']['total'])) {       // Get node experience ids.       $query = Drupal::entityTypeManager()->getStorage('node')->getQuery();       $nids = $query         ->condition('type', 'mynode')         ->range(0,1000)         ->accessCheck(FALSE)         ->execute();        $context['sandbox']['total'] = count($nids);       $context['sandbox']['node_ids'] = $nids;       $context['sandbox']['current'] = 0;     }     $node_ids = array_slice($context['sandbox']['node_ids'], $context['sandbox']['current'], 25);      foreach ($node_ids as $nid) {       $node = Drupal::entityTypeManager()->getStorage('node')->load($nid);       $node->set('field_my_field', 'my field value');       $node->save();     }      $context['sandbox']['current'] += count($node_ids);      Drupal::logger('test')->notice($context['sandbox']['current'] . ' Experiences passed / ' . $context['sandbox']['total']);      if ($context['sandbox']['total'] == 0) {       $context['sandbox']['#finished'] = 1;     }     else {        $context['sandbox']['#finished'] = ($context['sandbox']['current'] / $context['sandbox']['total']);     }   }    /**    * Batch Finished callback.    *    * @param bool $success    *   Success of the operation.    * @param array $results    *   Array of results for post processing.    * @param array $operations    *   Array of operations.    */   public  function processMyNodeFinished($success, array $results, array $operations) {      if ($success) {       $message = Drupal::translation()->formatPlural(count($results), 'One post processed.', '@count posts processed.');     }     else {       $message = t('Finished with an error.');     }     Drupal::logger('teset')->notice($message);   }  }