DOCSP-30384 MongoDB 7.0 Compatibility (#3370)

* DOCSP-30384 MongoDB 7.0 Compatibility

* fixes version numbers

* Adds downgrade link

* Fixes per Sarah

* Adds intra-node authentication section

* Fixes per Kelsey/Alan

* Fixes per Sarah

* Fixes per Dave

Author: kennethdyer

source/includes/fact-7.0-backwards-incompatible.rst

@@ -0,0 +1,21 @@
+
+The following 7.0 features are not compatible with earlier versions of
+MongoDB. To downgrade from MongoDB 7.0 to an earlier version, you must
+remove data that uses any of the following features:
+
+- :ref:`Capped collections <manual-capped-collection>` with a size that
+  is not a multiple of 256 bytes
+
+- Collections with ``encryptedFields`` with :ref:`range indexes
+  <sharding-ranged>`
+
+- Config servers that have collections with
+  ``changeStreamPreAndPostImages`` enabled
+
+- Config shards
+
+- Secondary :ref:`TTL indexes <index-feature-ttl>` with :ref:`partial
+  filters <index-type-partial>` on :ref:`time series collections
+  <manual-timeseries-collection>`
+
+- Time series collections with custom bucketing parameters

source/release-notes/7.0-compatibility.txt

@@ -17,4 +17,84 @@ Compatibility Changes in MongoDB 7.0
 .. include:: includes/rc-available.rst
 
 This page describes changes introduced in MongoDB 7.0 that can affect
-compatibility with older versions of MongoDB.
+compatibility with older versions of MongoDB.
+
+MongoDB 7.0 is a |lts| Release, which means that it is supported for
+both MongoDB Atlas and on-premises deployments. MongoDB 7.0 includes
+changes introduced in MongoDB Rapid Releases 6.1, 6.2, and 6.3. This
+page describes compatibility changes introduced in those Rapid Releases
+and MongoDB 7.0.
+
+To learn more about the differences between |lts| and Rapid Releases,
+see :ref:`release-version-numbers`.
+
+For detail on downgrading from MongoDB 7.0, see :ref:`7.0-downgrade`.
+
+Backward-Incompatible Features
+------------------------------
+
+.. include:: /includes/fact-7.0-backwards-incompatible
+
+Intra-Node Authentication
+-------------------------
+
+Starting in MongoDB 7.0, you can configure servers to authetnicate 
+X.509 certificates as cluster members identified by attributes or extension
+values.  You can also override this configuration to accept alternate 
+certificates during a rolling upgrade.
+
+To downgrade to MongoDB 6.0, perform the certificate rotation procedure to unset
+the :setting:`net.tls.clusterAuthX509` setting and rotate the cluster
+membership certificates to ones with matching DC, O, and OU attributes.
+
+Once this is complete, you can downgrade the cluster.  
+
+Time-Series
+-----------
+
+- Remove partial TTL indexes from time series collections.
+
+- Remove or modify collections using new index parameters.  In some cases, you
+  may use :dbcommand:`collMod` to switch to legacy granulairty settings, if not
+  you need to drop the collection before downgrading.
+
+Indexes
+-------
+
+Remove columnar indexes from collections before downgrading the server.
+
+Cluster Configuration
+---------------------
+
+Active :parameter:`setClusterParameter` paramemter operations prevent
+feature Compatibility Version (fCV) from successful completion.
+
+
+Encrypted Multi-Map (EMM)
+--------------------------
+
+Remove collections that use the ``encryptedFields`` collection option 
+before downgrading.
+
+Colocated Config Servers
+------------------------
+
+Remove colocated config servers from the cluster before downgrading.
+
+#. Run the :dbcommand:`transitionToDedicatedConfigServer` command 
+   to drain data from the config server.  
+
+   Wait for the balancert o move all chunks off the config server.
+
+#. Use the :dbcommand:`movePrimary` command to move databases off 
+   the config server.
+
+#. Run the :dbcommand:`transitionToDedicatedConfigServer` command to complete
+   the transition.
+
+Wildcard Indexes
+----------------
+
+Compound wildcard indexes require fCV 7.0 or greater. A pre-7.0
+:binary:`mongod` does not start if you are using one or more compound
+wildcard indexes.

source/release-notes/7.0.txt

@@ -329,26 +329,7 @@ Starting in MongoDB 7.0:
 Backward-Incompatible Features
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-The following 7.0 features are not compatible with earlier versions of
-MongoDB. To downgrade from MongoDB 7.0 to an earlier version, you must
-remove data that uses any of the following features:
-
-- Config shards
-
-- Secondary :ref:`TTL indexes <index-feature-ttl>` with :ref:`partial
-  filters <index-type-partial>` on :ref:`time-series collections
-  <manual-timeseries-collection>`
-
-- Time series collections with custom bucketing parameters
-
-- Collections with ``encryptedFields`` with :ref:`range indexes
-  <sharding-ranged>`
-
-- :ref:`Capped collections <manual-capped-collection>` with a size that
-  is not a multiple of 256 bytes
-
-- Config servers that have collections with
-  ``changeStreamPreAndPostImages`` enabled
+.. include:: /includes/fact-7.0-backwards-incompatible
 
 - Compound wildcard indexes require fCV 7.0 or greater. A pre-7.0
   :binary:`mongod` does not start if you are using one or more compound