operation exceeded time limit

When I am running momy, it will eventually crash and stop, instead of starting a new session. Since its impossible to revert to the last "known" state, I have to re-import all 15 million records...

16 Oct 08:17:52 - Insert a new record into database.trades
16 Oct 08:17:55 - Stream closed....
16 Oct 08:17:55 - { MongoError: operation exceeded time limit
at Function.MongoError.create (/usr/local/lib/node_modules/momy/node_modules/mongodb-core/lib/error.js:31:11)
at /usr/local/lib/node_modules/momy/node_modules/mongodb-core/lib/connection/pool.js:497:72
at authenticateStragglers (/usr/local/lib/node_modules/momy/node_modules/mongodb-core/lib/connection/pool.js:443:16)
at Connection.messageHandler (/usr/local/lib/node_modules/momy/node_modules/mongodb-core/lib/connection/pool.js:477:5)
at Socket. (/usr/local/lib/node_modules/momy/node_modules/mongodb-core/lib/connection/connection.js:333:22)
at Socket.emit (events.js:182:13)
at addChunk (_stream_readable.js:283:12)
at readableAddChunk (_stream_readable.js:264:11)
at Socket.Readable.push (_stream_readable.js:219:10)
at TCP.onread (net.js:638:20)
name: 'MongoError',
message: 'operation exceeded time limit',
ok: 0,
errmsg: 'operation exceeded time limit',
code: 50 }
16 Oct 08:17:56 - Bye

Start by reproducing the timeout while replicating database.trades and inspect the session and recovery path implicated by the crash; the payload names no repository files or tests. Done means a MongoError with code 50 no longer terminates replication, the last known state is preserved, and a new session can start without re-importing all records.

Written by the indexing model from the issue text.