DOCS-14286 update audit message for createIndex

Author: npentrel

source/reference/audit-message.txt

@@ -206,11 +206,25 @@ associated ``param`` details and the ``result`` values, if any.
           {
             ns: <database>.<collection>,
             indexName: <index name>,
-            indexSpec: <index specification>
+            indexSpec: <index specification>,
+            indexBuildState: <index build state>
           }
 
+       Possible values for ``indexBuildState`` are:
 
-     - ``0`` - Success
+       - ``IndexBuildStarted``
+       - ``IndexBuildSucceeded``
+       - ``IndexBuildAborted``
+
+     - | ``0`` - Success
+       | ``276`` - Index build aborted.
+
+       The audit message contains result code ``276`` for
+       :authaction:`createIndex` audit events with ``IndexBuildState``
+       set to ``IndexBuildAborted``. The audit message contains result
+       code ``0`` for :authaction:`createIndex` audit events with
+       ``IndexBuildState`` set to ``IndexBuildStarted`` or
+       ``IndexBuildSucceeded``.
 
    * - :authaction:`renameCollection`