DOCSP-23352 wait for index conversion (#63)

* DOCSP-23352 wait for index conversion

* Staging fixes

* Review feedback

* Review feedback

* Staging fixes

Author: Dave Cuthbert

source/reference/mongosync.txt

@@ -119,6 +119,24 @@ Global Options
 Behavior
 --------
 
+Commit
+~~~~~~
+
+To stop synchronizing, use the :ref:`commit <c2c-api-commit>` command
+on the destination cluster to convert indexes and finalize the changes.
+While ``commit`` is running:
+
+- Writes are blocked on the source cluster.
+- Writes are blocked on the destination cluster until ``mongosync``
+  begins index validation.
+
+To monitor the ``commit`` process, use the :ref:`progress
+<c2c-api-progress>` command:
+
+- The destination cluster is writable when ``canWrite`` is true.
+- Index conversion is complete when ``mongosync`` enters the
+  ``COMMITTED`` state.
+
 .. _c2c-mongosync-config:
 
 Configuration File