fix #1761 (#1973)

* Message转Dml对null值的判断

* Message转Dml对null值的判断

* Message转Dml对null值的判断

* fix #1761

client-adapter/elasticsearch/src/main/java/com/alibaba/otter/canal/client/adapter/es/support/ESTemplate.java

@@ -210,16 +210,16 @@ public class ESTemplate {
                     }
                 }
             }
+            resetBulkRequestBuilder();
         }
     }
 
     /**
-     * 如果大于批量数则提交批次, 调用后es bulk请求后，numberOfActions不会清理，需要主动调用函数清0，否则不能起到批量请求的效果
+     * 如果大于批量数则提交批次
      */
     private void commitBulk() {
         if (getBulk().numberOfActions() >= MAX_BATCH_SIZE) {
             commit();
-            resetBulkRequestBuilder();
         }
     }