Added ability to update registry's index after meta parser run.

src/Builders/BaseBuilder.php

@@ -297,6 +297,7 @@ protected function do($method, PageRegistry $registry, $pages = [])
             else {
                 call_user_func(array($obj, $method), $pages, $registry);
             }
+            $registry->updateIndexes();
         }
     }
 }

src/Page/PageRegistry.php

@@ -80,6 +80,11 @@ public function save(Page $page);
      */
     public function saveAll();
 
+    /**
+     * @return mixed
+     */
+    public function updateIndexes();
+
     /**
      * @param Page $page
      * @return $this

src/Page/SimplePageRegistry.php

@@ -365,6 +365,21 @@ public function delete(Page $page)
         return $this;
     }
 
+    /**
+     * Update all indexes from existing pages.
+     *
+     * @return mixed|void
+     * @throws PageException
+     */
+    function updateIndexes() {
+        foreach ($this->pages as $localeSlug => $page) {
+            if ($localeSlug !== $page->localeSlug()) {
+                $this->add($page);
+                $this->scratch($localeSlug);
+            }
+        }
+    }
+
     /**
      * Temporarily add a page to repository. You need to call saveAll to persist them.
      * @param Page $page