fix

@@ -167,9 +167,12 @@ public class YohoIndexServiceImpl implements IYohoIndexService, ApplicationEvent
 		if (oldRealIndexName != null) {
 		if (oldRealIndexName != null) {
 			client.removeAlias(oldRealIndexName, alias);
 			client.removeAlias(oldRealIndexName, alias);
 		}
 		}
-		// 5、添加新索引别名
+		// 5、添加新索引别名【如果存在一个名字为alias的真实索引，则直接删除】
+		if(client.indexExists(alias)){
+			client.deleteIndex(alias);
+		}
 		client.addAlias(newRealIndexName, alias);
 		client.addAlias(newRealIndexName, alias);
-		// 6、删除旧索引
+		// 7、删除旧索引
 		if (oldRealIndexName != null) {
 		if (oldRealIndexName != null) {
 			client.deleteIndex(oldRealIndexName);
 			client.deleteIndex(oldRealIndexName);
 		}
 		}