Wed May  2 16:42:27 [conn2] build index aggdb.c { _id: 1 }
Wed May  2 16:42:27 [conn2] build index done.  scanned 0 total records. 0 secs
Wed May  2 16:42:27 [conn2] insert aggdb.c keyUpdates:0 434ms
assert failed : s5012 failed
Error("Printing Stack Trace")@:0
()@src/mongo/shell/utils.js:37
("assert failed : s5012 failed")@src/mongo/shell/utils.js:58
(false,"s5012 failed")@src/mongo/shell/utils.js:66
@jstests/aggregation/server5012.js:27

assert failed : s5012 failed