backport of commit 299fe69 (hashicorp#20390)

Co-authored-by: Josh Black <raskchanky@users.noreply.github.com>

website/content/api-docs/system/replication/index.mdx

@@ -59,8 +59,7 @@ depending on the number and size of objects in the data store.
   process. This setting can be used to reduce the amount of time the tree is locked
   during a reindex process. If this node is killed before the full tree has been
   asynchronously flushed the reindex may not have applied fully and a new reindex
-  may need to be done. Shutting down this node cleanly will cause the tree to be
-  flushed prior to shutdown. Defaults false.
+  may need to be done. Defaults false.
 
 ### Sample Payload