bitbucket lister did more work than before, currently listed 510k repositories.
But it seems to be stuck there.
From kibana's dashboard, we can see the following (log message needs to be improved), the date is the index.
```
[2019-06-28 08:46:30,942: WARNING/ForkPoolWorker-5] giving up on 2015-05-02 12:37:07.608575+00:00: max retries exceeded
[2019-06-28 08:46:20,931: WARNING/ForkPoolWorker-5] connection error on 2015-05-02 12:37:07.608575+00:00: sleep for 10 seconds
[2019-06-28 08:46:09,366: WARNING/ForkPoolWorker-5] connection error on 2015-05-02 12:37:07.608575+00:00: sleep for 10 seconds
```
There exists rate limit policies in bitbucket [2], so that might be the reason.
[1] http://kibana0.internal.softwareheritage.org:5601/app/kibana#/dashboard/ce225b20-998c-11e9-ad62-c3b20d6a84bb
[2] https://confluence.atlassian.com/bitbucket/rate-limits-668173227.html?_ga=2.125982285.1517600277.1561721528-61276570.1561721528