DOCS-14281 add release notes and update partial index restrictions

Author: ianf-mongodb

source/core/index-partial.txt

@@ -162,17 +162,11 @@ by the filter expression
 Restrictions
 ------------
 
-In MongoDB, you cannot create multiple versions of an index that
-differ only in the options. As such, you cannot create multiple
-partial indexes that differ only by the filter expression.
+.. include:: /includes/fact-5.0-multiple-partial-index.rst
 
 You cannot specify both the ``partialFilterExpression`` option and
 the ``sparse`` option.
 
-MongoDB 3.0 or earlier do not support partial indexes. To use partial
-indexes, you must use MongoDB version 3.2 or higher. For sharded
-clusters or replica sets, all nodes must be version 3.2 or higher.
-
 ``_id`` indexes cannot be partial indexes.
 
 Shard key indexes cannot be partial indexes.

source/includes/fact-5.0-multiple-partial-index.rst

@@ -0,0 +1,10 @@
+Starting in MongoDB 5.0, multiple 
+:doc:`partial indexes </core/index-partial>`
+can be created using the same :ref:`key pattern<key_patterns>` as long 
+as the :ref:`partialFilterExpression <partialFilterExpression>`  
+fields do not express equivalent filters.
+
+In earlier versions of MongoDB, creating multiple
+:doc:`partial indexes</core/index-partial>` is not allowed when 
+using the same key pattern with different
+:ref:`partialFilterExpressions <partialFilterExpression>`.

source/reference/method/db.collection.createIndexes.txt

@@ -38,7 +38,9 @@ Definition
 
         - document
 
-        - An array containing index specification documents. Each document
+        - .. _key_patterns:
+
+          An array containing index specification documents. Each document
           contains field and value pairs where the field is
           the index key and the value describes the type of index for that
           field. For an ascending index on a field, specify a value of ``1``; for
@@ -270,7 +272,9 @@ otherwise specified:
 
      - document
 
-     - Optional. If specified, the indexes only reference documents that match the
+     - .. _partialFilterExpression:
+
+       Optional. If specified, the indexes only reference documents that match the
        filter expression. See :doc:`/core/index-partial` for more
        information.
 

source/release-notes/5.0.txt

@@ -293,6 +293,11 @@ truncations.
 Indexes
 -------
 
+Partial Indexes Behavior Change
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. include:: /includes/fact-5.0-multiple-partial-index.rst
+
 Cannot Drop ``Ready`` Indexes During In-Progress Index Builds
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~