DOCS-14205 BACKPORT (#1545)

Author: Dave Cuthbert

source/includes/extracts-parent-fact-covered-query-sharded-collection.yaml

@@ -8,12 +8,7 @@ content: |
 
   Starting in MongoDB 3.0, an index cannot {{cover}} a query on a
   :term:`sharded <shard>` collection when run against a
-  :binary:`~bin.mongos` if the index does not contain the shard key,
-  with the following exception for the ``_id`` index: If a query on a
-  sharded collection only specifies a condition on the ``_id`` field
-  and returns only the ``_id`` field, the ``_id`` index can cover the
-  query when run against a :binary:`~bin.mongos` even if the ``_id``
-  field is not the shard key.
+  :binary:`~bin.mongos` if the index does not contain the shard key.
 
   In previous versions, an index cannot :ref:`cover <covered-queries>`
   a query on a :term:`sharded <shard>` collection when run against a