2015-08-04T06:37:49.530+0000 E REPL     [repl writer worker 9] writer worker caught exception:  :: caused by :: 11000 E11000 duplicate key error collection: talk-vsession.visitorSessions index: _id_ dup key: { : ObjectId('55c05dbdd896ff11c05bf548') } on: { ts: Timestamp 1438670269000|632, h: -3999426385275226819, v: 2, op: "u", ns: "talk-vsession.visitorSessions", o2: { _id: ObjectId('55c05dbdd896ff11c05bf548') }, o: { $set: { sm: "e56d8d2df5c4e6761a36b7e88efe0681853a6f54", uo: new Date(1438670269476) } } }
2015-08-04T06:37:49.530+0000 I -        [repl writer worker 9] Fatal Assertion 16360
2015-08-04T06:37:49.530+0000 I -        [repl writer worker 9] 

***aborting after fassert() failure