Do not pass the document's current version to elasticsearch.update when retry_on_conflict is not None

Author: armando

elasticsearch_dsl/document.py

@@ -401,6 +401,7 @@ def update(
 
         if retry_on_conflict is not None:
             doc_meta["retry_on_conflict"] = retry_on_conflict
+            doc_meta["version"] = None
 
         # Optimistic concurrency control
         if "seq_no" in self.meta and "primary_term" in self.meta: