LSIF: error cleaning worker queues

Created by: chrismwendt

On 3bb9583ee0c5c43479dda2c46232d4208cda6ef8 (lsif-logging branch), I ran into this error:

18:24:06            lsif-server | ERROR scheduler error {
18:24:06            lsif-server |   service: 'lsif-server',
18:24:06            lsif-server |   error: 'force-cleaning worker REDACTED, but cannot find queues'
18:24:06            lsif-server | }

I don't see a stack trace, so I'm not sure where this is coming from.