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diff --git a/web/core/modules/migrate/src/Plugin/migrate/process/Iterator.php b/web/core/modules/migrate/src/Plugin/migrate/process/Iterator.php
index d85abfdb3..4878ad45f 100644
--- a/web/core/modules/migrate/src/Plugin/migrate/process/Iterator.php
+++ b/web/core/modules/migrate/src/Plugin/migrate/process/Iterator.php
@@ -2,65 +2,19 @@
 
 namespace Drupal\migrate\Plugin\migrate\process;
 
-use Drupal\migrate\ProcessPluginBase;
-use Drupal\migrate\MigrateExecutableInterface;
-use Drupal\migrate\Row;
+@trigger_error('The ' . __NAMESPACE__ . '\Iterator is deprecated in Drupal 8.4.x and will be removed before Drupal 9.0.0. Instead, use ' . __NAMESPACE__ . '\SubProcess', E_USER_DEPRECATED);
 
 /**
- * This plugin iterates and processes an array.
+ * Iterates and processes an associative array.
  *
- * @link https://www.drupal.org/node/2135345 Online handbook documentation for iterator process plugin @endlink
+ * @deprecated in Drupal 8.4.x and will be removed in Drupal 9.0.x. Use
+ *   \Drupal\migrate\Plugin\migrate\process\SubProcess instead.
+ *
+ * @see https://www.drupal.org/node/2880427
  *
  * @MigrateProcessPlugin(
  *   id = "iterator",
  *   handle_multiples = TRUE
  * )
  */
-class Iterator extends ProcessPluginBase {
-
-  /**
-   * Runs a process pipeline on each destination property per list item.
-   */
-  public function transform($value, MigrateExecutableInterface $migrate_executable, Row $row, $destination_property) {
-    $return = [];
-    if (!is_null($value)) {
-      foreach ($value as $key => $new_value) {
-        $new_row = new Row($new_value, []);
-        $migrate_executable->processRow($new_row, $this->configuration['process']);
-        $destination = $new_row->getDestination();
-        if (array_key_exists('key', $this->configuration)) {
-          $key = $this->transformKey($key, $migrate_executable, $new_row);
-        }
-        $return[$key] = $destination;
-      }
-    }
-    return $return;
-  }
-
-  /**
-   * Runs the process pipeline for the current key.
-   *
-   * @param string|int $key
-   *   The current key.
-   * @param \Drupal\migrate\MigrateExecutableInterface $migrate_executable
-   *   The migrate executable helper class.
-   * @param \Drupal\migrate\Row $row
-   *   The current row after processing.
-   *
-   * @return mixed
-   *   The transformed key.
-   */
-  protected function transformKey($key, MigrateExecutableInterface $migrate_executable, Row $row) {
-    $process = ['key' => $this->configuration['key']];
-    $migrate_executable->processRow($row, $process, $key);
-    return $row->getDestinationProperty('key');
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function multiple() {
-    return TRUE;
-  }
-
-}
+class Iterator extends SubProcess {}