Add bootstrap model dependecies support

apps/document_indexing/registry.py

@@ -5,10 +5,12 @@ from .cleanup import cleanup
 bootstrap_models = [
     {
         'name': 'index',
+        'dependencies': ['documents.documenttype']
     },
     {
         'name': 'indextemplatenode',
         'sanitize': False,
+        'dependencies': ['document_indexing.index']
     }
 ]
 cleanup_functions = [cleanup]