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wording of warning in agg #744

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wording of warning in agg #744

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6 changes: 5 additions & 1 deletion source/reference/aggregation/sort.txt
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Expand Up @@ -56,7 +56,11 @@ $sort (aggregation)
.. include:: /includes/fact-agg-sort-limit.rst

.. warning:: Unless the :pipeline:`$sort` operator can use an index,
the :pipeline:`$sort` operation must fit within memory.
or in 2.4, immediately precedes a :pipeline:`$limit`, the
:pipeline:`$sort` operation must fit within memory. For
:pipeline:`$sort` operations that immediately precedes a
:pipeline:`$limit` stage in 2.4, the limited results must fit
within memory.

.. todo:: if a sort precedes the first $group in a sharded system,
all documents must go to the mongos for sorting.