code: public static function update($id, $document, $connection)
      {
          $from = $connection->db;
          if (strpos($from, '.') !== false) {
              $tmp = explode('.', $connection->db);
              $from = end($tmp);
          }
  
          $connection->method = 'PATCH';
          $connection->action = '['.urlencode($id).']';
          switch (gettype($document)) {
              case "string":
                  $connection->query = $document;
                  break;
              case "array":
              case "object":
                  $connection->method = 'POST';
                  $connection->action = '/_query';
                  $connection->query = 'UPDATE '.$from.'["'.$id.'"] SET '.self::updateRecursion($document);
                  break;
              default:
                  throw new ClusterpointException("\"->update()\" function: parametr passed ".json_encode(self::escape_string($document))." is not in valid format.", 9002);
                  break;
  
          }
          return self::sendQuery($connection);
      }
docs: Set query parametrs to execute - Update by "_id".
  
  @param  string  $id
  @param  array|object  $document
  @param  \stdClass $connection
  @return \Clusterpoint\Response\Single