Reorganize and sort models and managers according to Mayan's best practices.

Signed-off-by: Michael Price <loneviking72@gmail.com>

mayan/apps/document_indexing/managers.py

@@ -9,13 +9,13 @@ class DocumentIndexInstanceNodeManager(models.Manager):
 
 
 class IndexManager(models.Manager):
+    def get_by_natural_key(self, name):
+        return self.get(name=name)
+
     def index_document(self, document):
         for index in self.filter(enabled=True, document_types=document.document_type):
             index.index_document(document=document)
 
-    def get_by_natural_key(self, name):
-        return self.get(name=name)
-
     def rebuild(self):
         for index in self.all():
             index.rebuild()