diff --git a/opensearch/client.go b/opensearch/client.go
index 0292dec..f5e3beb 100644
--- a/opensearch/client.go
+++ b/opensearch/client.go
@@ -184,6 +184,8 @@ func (c *Client) sendLoop(ctx context.Context) {
 				return
 			}
 
+			logger.Println("log send bulk failed. retry :", respbody.Items)
+
 			var retry [][]byte
 			for i, item := range respbody.Items {
 				if item.Create.Status < 400 {