Illuminate\Database\Eloquent\Model::getConnection PHP Method

    public function getConnection()
    {
        return static::resolveConnection($this->getConnectionName());
    }

 /**
  * Import an Eloquent
  *
  * @param Model $model
  * @param array $relations
  * @param int $batchSize
  * @param callable $callback
  * @internal param $type
  */
 public function import(Model $model, $relations = [], $batchSize = 750, callable $callback = null)
 {
     $batch = 0;
     $asQueryLoggind = $model->getConnection()->logging();
     $model->getConnection()->disableQueryLog();
     while (true) {
         // Increase the batch number
         $batch += 1;
         // Load records from the database
         $records = $model->newInstance()->with($relations)->skip($batchSize * ($batch - 1))->take($batchSize)->get();
         // Break out of the loop if we are out of records
         if (count($records) == 0) {
             break;
         }
         // Call the callback function to provide feedback on the import process
         if ($callback) {
             $callback($batch);
         }
         // Transform each record before sending it to Elasticsearch
         $data = [];
         foreach ($records as $record) {
             $data[] = ['index' => ['_id' => $record->getEsId()]];
             $data[] = $record->transform(!empty($relations));
         }
         // Bulk import the data to Elasticsearch
         $this->bulk($data);
     }
     if ($asQueryLoggind) {
         $model->getConnection()->enableQueryLog();
     }
 }