Allow aggregation $mergeCursors stage to run inside a transaction

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    • Fully Compatible
    • Query 2018-12-03, Query 2018-12-17, Query 2018-12-31
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      We banned aggregations within transactions on mongos as part of SERVER-33660, because doing so could potentially cause a deadlock. We should investigate how to perform a $mergeCursors against the same shard without inducing a deadlock. One idea is to avoid going over the network for a local cursor.

            Assignee:
            Ian Boros
            Reporter:
            Charlie Swanson
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