account for old versions of es

curator/actions.py

@@ -1890,6 +1890,10 @@ def __init__(self, ilo, shrink_node='DETERMINISTIC', node_filters={},
         if extra_settings:
             self._merge_extra_settings(extra_settings)
 
+        self.shrink_copy_settings = {'copy_settings': 'true'}
+        if utils.get_version(self.client) < (6,4,3):
+            self.shrink_copy_settings = ''
+
     def _merge_extra_settings(self, extra_settings):
         self.loggit.debug(
             'Adding extra_settings to shrink body: '
@@ -2151,7 +2155,8 @@ def do_action(self):
                     # Do the shrink
                     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={'copy_settings':'true'}, target=target, body=self.body, wait_for_active_shards=self.wait_for_active_shards)
+
+                        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))