Remove comment and unused import

mayan/apps/document_indexing/tools.py

@@ -3,7 +3,7 @@ from __future__ import absolute_import
 from documents.models import Document
 
 from .api import index_document
-from .models import Index, IndexInstanceNode
+from .models import IndexInstanceNode
 
 
 def do_rebuild_all_indexes():
@@ -11,5 +11,4 @@ def do_rebuild_all_indexes():
         instance_node.delete()
 
     for document in Document.objects.all():
-        # TODO: Launch all concurrently as background tasks
         index_document(document)