postcommit_event instead of precommit_event

precommit_event is too early to access in_state relation of workflowable entity

hooks.py

@@ -69,7 +69,7 @@
 
 class IndexEsOperation(hook.DataOperationMixIn, hook.Operation):
 
-    def precommit_event(self):
+    def postcommit_event(self):
         indexer = self.cnx.vreg['es'].select('indexer', self.cnx)
         es = indexer.get_connection()
         if es is None or not self.cnx.vreg.config['index-name']: