diff -r 0b46440b1b45 -r 54fa3db5becf mercurial/configitems.py
--- a/mercurial/configitems.py	Wed Oct 11 22:51:23 2017 +0200
+++ b/mercurial/configitems.py	Wed Oct 11 22:53:17 2017 +0200
@@ -591,6 +591,9 @@
 coreconfigitem('progress', 'estimateinterval',
     default=60.0,
 )
+coreconfigitem('progress', 'format',
+    default=lambda: ['topic', 'bar', 'number', 'estimate'],
+)
 coreconfigitem('progress', 'refresh',
     default=0.1,
 )