[allura:tickets] #8348 Support mongo 3.6+

[Dave Brondsema <da...@brondsema.net>]

- **status**: open --> in-progress
- **assigned_to**: Dave Brondsema



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** [tickets:#8348] Support mongo 3.6+**

**Status:** in-progress
**Milestone:** unreleased
**Created:** Wed Jan 22, 2020 07:13 PM UTC by Dave Brondsema
**Last Updated:** Wed Jan 22, 2020 07:16 PM UTC
**Owner:** Dave Brondsema


Reported initially at [#7935] this occurs during a project export, probably other places too:
```
OperationFailure: command SON([('aggregate', u'attachment.files'),
('pipeline', [{'$match': {'_id': {'$in': []}}}, {'$group': {'total_size':
{'$sum': '$length'}, '_id': 'total'}}, {'$project': {'total_size':
{'$divide': ['$total_size', 1000000]}, '_id': 0}}])]) on namespace
project-data.$cmd failed: The 'cursor' option is required, except for
aggregate with the explain argument
```


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