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

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

* CR1

* CR 1.5

Author: ianf-mongodb

source/aggregation.txt

@@ -21,7 +21,7 @@ results. You can use aggregation operations to:
 
 To perform aggregation operations, you can use:
 
-- :ref:`Aggregation pipelines <aggregation-framework>`, which are the
+- :ref:`Aggregation pipelines <aggregation-pipeline-intro>`, which are the
   preferred method for performing aggregations.
 
 - :ref:`Single purpose aggregation methods
@@ -32,7 +32,7 @@ To perform aggregation operations, you can use:
   deprecated starting in MongoDB 5.0. Instead, use an aggregation
   pipeline.
 
-.. _aggregation-framework:
+.. _aggregation-pipeline-intro:
 
 Aggregation Pipelines
 ---------------------
@@ -76,7 +76,8 @@ aggregate documents from a single collection:
        specified field.
 
 The single purpose aggregation methods are simple but lack the
-capabilities of an :ref:`aggregation pipeline <aggregation-framework>`.
+capabilities of an :ref:`aggregation pipeline 
+<aggregation-pipeline-intro>`.
 
 .. _aggregation-map-reduce:
 

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

@@ -384,8 +384,7 @@ Using Aggregation Pipelines with Clusters
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 For more information on how sharding works with :ref:`aggregations
-<aggregation-framework>`, read the sharding chapter in the `Practical
+<aggregation-pipeline>`, read the sharding chapter in the `Practical
 MongoDB Aggregations
 <https://www.practical-mongodb-aggregations.com/guides/sharding.html>`__
 e-book.
- 

source/core/timeseries-collections.txt

@@ -221,7 +221,7 @@ Run Aggregations on a Time Series Collection
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 For additional query functionality, use an :ref:`aggregation pipeline
-<aggregation-framework>` such as:
+<aggregation-pipeline>` such as:
 
 .. code-block:: javascript
 

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

@@ -398,8 +398,8 @@ Practical MongoDB Aggregations E-Book
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 For more information on how sharding works with
-:ref:`aggregations <aggregation-framework>`, read the sharding chapter
-in the `Practical MongoDB Aggregations
+:doc:`aggregations </aggregation>`, read the sharding 
+chapter in the `Practical MongoDB Aggregations
 <https://www.practical-mongodb-aggregations.com/guides/sharding.html>`__
 e-book.
 

source/tutorial/getting-started.txt

@@ -265,7 +265,7 @@ examples in the shell above.
       You can use aggregation to group values from multiple documents
       together and return a single result. Aggregation in MongoDB
       is performed with an :ref:`aggregation pipeline
-      <aggregation-framework>`.
+      <aggregation-pipeline>`.
 
       While :method:`~db.collection.find()` operations are useful for
       data retrieval, the aggregation pipeline allows you to manipulate