diff --git a/opensearch/client.go b/opensearch/client.go
index e7db124..fa29ea9 100644
--- a/opensearch/client.go
+++ b/opensearch/client.go
@@ -220,13 +220,26 @@ func (c *Client) sendLoop(ctx context.Context) {
 
 		var retry []*singleLogMarshaller
 		for i, item := range respbody.Items {
-			if item.Create.Status < 400 {
-				// 재시도
+			if item.Create.Status < 300 {
+				continue
+			}
+
+			if item.Create.Status == 429 || item.Create.Status >= 500 {
+				logger.Println("[LogStream] send bulk failed but retry. status :", item.Create.Status)
 				retry = append(retry, logs[i])
+			} else if item.Create.Status == 400 {
+				// 구문 오류. 재시도 불가
+				if i < len(logs) {
+					logger.Println("[LogStream] send bulk failed. status 400 :", string(logs[i].content))
+				} else {
+					logger.Println("[LogStream] send bulk failed. status 400 but out of index :", i, len(logs))
+				}
+			} else {
+				// 일단 로그만
+				logger.Println("[LogStream] send bulk failed but no retry. status :", item.Create.Status)
 			}
 		}
 
-		logger.Println("[LogStream] send bulk failed. retry :", len(retry), len(logs), respbody.Items)
 		if len(retry) > 0 {
 			failChan <- retry
 		}