Migrate the bio field in the story migration.

web/modules/custom/geo_upgrade/src/Plugin/migrate/process/StoryBio.php

@@ -0,0 +1,29 @@
+<?php
+
+
+namespace Drupal\geo_upgrade\Plugin\migrate\process;
+
+use Drupal\migrate\MigrateExecutableInterface;
+use Drupal\migrate\MigrateSkipRowException;
+use Drupal\migrate\ProcessPluginBase;
+use Drupal\migrate\Row;
+
+/**
+ * @MigrateProcessPlugin(
+ *   id = "geo_story_bio"
+ * )
+ */
+class StoryBio extends ProcessPluginBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function transform($value, MigrateExecutableInterface $migrate_executable, Row $row, $destination_property) {
+    $result = [];
+    foreach ($value[0] as $key => $item) {
+      $result[$key] = $item;
+      $result[$key]['bio'] = isset($value[1][0]['value']) ? $value[1][0]['value'] : '';
+    }
+    return $result;
+  }
+}