Issue #2233029 by benjy: Add a Book destination to the Migrate API.

core/modules/migrate/lib/Drupal/migrate/Plugin/migrate/destination/Book.php

@@ -0,0 +1,35 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\migrate\Plugin\migrate\destination\Book.
+ */
+
+namespace Drupal\migrate\Plugin\migrate\destination;
+
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\migrate\Row;
+
+/**
+ * @MigrateDestination(
+ *   id = "book",
+ *   provider = "book"
+ * )
+ */
+class Book extends EntityContentBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static function getEntityTypeId($plugin_id) {
+    return 'node';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function updateEntity(EntityInterface $entity, Row $row) {
+    $entity->book = $row->getDestinationProperty('book');
+  }
+
+}