(DOCSP-36307) Backport to 5.0 (#6283) (#6286)

Author: jeff-allen-mongo

source/core/index-single.txt

@@ -111,6 +111,8 @@ Create an Index on Embedded Document
 
 You can also create indexes on embedded document as a whole.
 
+.. include:: /includes/indexes/embedded-object-need-entire-doc.rst
+
 Consider a collection named ``schools`` that holds documents that
 resemble the following sample document:
 

source/includes/indexes/embedded-object-need-entire-doc.rst

@@ -0,0 +1,3 @@
+When you create an index on an embedded document, only queries that
+specify the entire embedded document use the index. Queries on a
+specific field within the document do not use the index.

source/indexes.txt

@@ -49,10 +49,15 @@ example, consider the following scenarios:
    * - A salesperson often needs to look up client information by
        location. Location is stored in an embedded object with fields
        like ``state``, ``city``, and ``zipcode``. You can create an
-       index on the entire ``location`` object to improve performance
-       for queries on any field in that object.
+       index on the ``location`` object to improve performance for
+       queries on that object.
 
-     - :ref:`Single Field Index <indexes-single-field>` on an object
+       .. note::
+
+          .. include:: /includes/indexes/embedded-object-need-entire-doc.rst
+
+     - :ref:`Single Field Index <indexes-single-field>` on an embedded
+       document
 
    * - A grocery store manager often needs to look up inventory items by
        name and quantity to determine which items are low stock. You can