diff --git a/curator/actions.py b/curator/actions.py
index 0ad99459..7afaf56f 100644
--- a/curator/actions.py
+++ b/curator/actions.py
@@ -2309,11 +2309,13 @@ def do_action(self):
                     self.loggit.info('Shrinking index "{0}" to "{1}" with settings: {2}, wait_for_active_shards={3}'.format(idx, target, self.body, self.wait_for_active_shards))
                     try:
 
+
                         self.client.indices.shrink(index=idx, params=self.shrink_copy_settings, target=target, body=self.body, wait_for_active_shards=self.wait_for_active_shards)
-                        self.loggit.debug('unblocking writes on {0}'.format(target))
-                        self._unblock_writes(target)
-                        self.loggit.debug('undoing route reqs for {0}'.format(target))
-                        self.route_index(target, 'require', '_name', '')
+                        if utils.get_version(self.client) >= (6,4,3):
+                            self.loggit.debug('unblocking writes on {0}'.format(target))
+                            self._unblock_writes(target)
+                            self.loggit.debug('undoing route reqs for {0}'.format(target))
+                            self.route_index(target, 'require', '_name', '')
                         # Wait for it to complete
                         if self.wfc:
                             self.loggit.debug('Wait for shards to complete allocation for index: {0}'.format(target))