catch out-of-bounds error

pkg/es/search.go

@@ -135,6 +135,10 @@ func searchPit(conf *cfg.Config, req *search.Request) error {
 	for {
 		res, err := search.Do(ctx)
 		if err != nil {
+			if strings.Contains(err.Error(), "reason: all shards failed") {
+				return nil
+			}
+
 			return fmt.Errorf("failed to run search (esdsl pit): %s", err)
 		}