Docsp 19108 v4.4 (#697)

* DOCSP-19108 update aggregation-framework -> aggregation-pipeline-intro (#686)

* DOCSP-19108 update aggregation-framework -> aggregation-pipeline-intro

* CR1

* CR 1.5

* removing timeseries-collections.txt

* rearranging sharding additional info

* fix bullets on sharding additional info

Author: ianf-mongodb

source/aggregation.txt

@@ -21,14 +21,14 @@ results. You can use aggregation operations to:
 
 To perform aggregation operations, you can use:
 
-- :ref:`Aggregation pipelines <aggregation-framework>`
+- :ref:`Aggregation pipelines <aggregation-pipeline-intro>`
 
 - :ref:`Single purpose aggregation methods
   <single-purpose-agg-operations>`
 
 - :ref:`Map-reduce functions <aggregation-map-reduce>`
 
-.. _aggregation-framework:
+.. _aggregation-pipeline-intro:
 
 Aggregation Pipelines
 ---------------------
@@ -85,6 +85,10 @@ pipeline.
 
 .. include:: /images/distinct.rst
 
+The single purpose aggregation methods are simple but lack the
+capabilities of an :ref:`aggregation pipeline 
+<aggregation-pipeline-intro>`.
+
 .. _aggregation-map-reduce:
 
 Map-Reduce

source/core/sharded-cluster-query-router.txt

@@ -379,3 +379,12 @@ Connection Pools
 .. |newversion| replace:: 4.2
 
 .. |oldversion| replace:: 4.0
+
+Using Aggregation Pipelines with Clusters
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+For more information on how sharding works with :ref:`aggregations
+<aggregation-pipeline>`, read the sharding chapter in the `Practical
+MongoDB Aggregations
+<https://www.practical-mongodb-aggregations.com/guides/sharding.html>`__
+e-book.

source/reference/operator/aggregation/function.txt

@@ -134,10 +134,10 @@ Alternative to ``$where``
 The query operator :query:`$where` can also be used to specify
 JavaScript expression. However:
 
-- Starting in MongoDB 3.6, the :query:`$expr` operator allows the use
-  of :ref:`aggregation expressions <aggregation-framework>` within the
+- The :query:`$expr` operator allows the use of 
+  :ref:`aggregation expressions <aggregation-expressions>` within the
   query language.
-  
+
 - Starting in MongoDB 4.4, the :expression:`$function` and
   :group:`$accumulator` allows users to define custom aggregation
   expressions in JavaScript if the provided :doc:`pipeline operators
@@ -230,9 +230,8 @@ Example 2: Alternative to ``$where``
 
 .. note:: Aggregation Alternatives Preferred over ``$where``
 
-
-   Starting in MongoDB 3.6, the :query:`$expr` operator allows the use
-   of :ref:`aggregation expressions <aggregation-framework>` within the
+   The :query:`$expr` operator allows the use of 
+   :ref:`aggregation expressions <aggregation-expressions>` within the
    query language. And, starting in MongoDB 4.4, the
    :expression:`$function` and :group:`$accumulator` allows users to
    define custom aggregation expressions in JavaScript if the provided

source/reference/operator/query/where.txt

@@ -40,10 +40,9 @@ Definition
 
 .. note:: Aggregation Alternatives Preferred
 
-
-   Starting in MongoDB 3.6, the :query:`$expr` operator allows the use
-   of :ref:`aggregation expressions <aggregation-framework>` within the
-   query language. And, starting in MongoDB 4.4, the
+   The :query:`$expr` operator allows the use of 
+   :ref:`aggregation expressions <aggregation-expressions>` within
+   the query language. And, starting in MongoDB 4.4, the
    :expression:`$function` and :group:`$accumulator` allows users to
    define custom aggregation expressions in JavaScript if the provided
    :doc:`pipeline operators </reference/operator/aggregation>` cannot

source/sharding.txt

@@ -382,8 +382,16 @@ available on sharded clusters.
 
 .. include:: /includes/extracts/transactions-committed-visibility.rst
 
+Additional Information
+~~~~~~~~~~~~~~~~~~~~~~
 
-For details, see:
+For more information on how sharding works with
+:doc:`aggregations </aggregation>`, read the sharding 
+chapter in the `Practical MongoDB Aggregations
+<https://www.practical-mongodb-aggregations.com/guides/sharding.html>`__
+e-book.
+
+See also:
 
 - :doc:`/core/transactions`
 - :doc:`/core/transactions-production-consideration`