DOCS-16583 bounded clustered ixscan allowed in notablescan (#7066) (#7348)

* DOCS-16583 bounded clustered ixscan allowed in notablescan

* DOCS-16583 bounded clustered ixscan allowed in notablescan

* DOCS-16583 bounded clustered ixscan allowed in notablescan

* DOCS-16583 bounded clustered ixscan allowed in notablescan

* DOCS-16583 copy edit

* DOCS-16583 tech edit

* DOCS-16583 tech edit

* DOCS-16583 tech edit

* DOCS-16583 tech edit

* DOCS-16583 build error

Author: ltran-mdb2

source/reference/explain-results.txt

@@ -880,7 +880,6 @@ The other fields are:
 
    Estimated time in milliseconds for the query execution.
 
-
 .. _explain-output-collection-scan:
 
 Collection Scan
@@ -895,10 +894,23 @@ key pattern, direction of traversal, and index bounds.
 
 Starting in MongoDB 5.3, if the query planner selects a :ref:`clustered
 index <db.createCollection.clusteredIndex>` for a :ref:`clustered
-collection <clustered-collections>`, the explain result includes a
+collection <clustered-collections>` and the query contains bounds that
+define the portion of the index to search, the explain result includes a
 ``CLUSTERED_IXSCAN`` stage. The stage includes information about the
 clustered index key and index bounds.
 
+If the query planner selects a :ref:`clustered index
+<db.createCollection.clusteredIndex>` for a :ref:`clustered collection
+<clustered-collections>` and the query *does not* contain bounds, the
+query performs an unbounded collection scan and the explain result
+includes a ``COLLSCAN`` stage.
+
+.. note::
+
+   The :parameter:`notablescan` parameter does not allow unbounded
+   queries that use a clustered index because the queries require a
+   full collection scan. 
+
 For more information on execution statistics of collection scans, see
 :doc:`/tutorial/analyze-query-plan`.
 

source/reference/parameters.txt

@@ -1371,6 +1371,13 @@ General Parameters
 
    .. include:: /includes/fact-runtime-startup-parameter
 
+   .. note::
+
+      ``notablescan`` does not allow unbounded queries that use a
+      clustered index because the queries require a full collection
+      scan. For more information, see :ref:`Collection Scans
+      <explain-output-collection-scan>`.
+
 .. parameter:: ttlMonitorEnabled
 
    |mongod-only|