fix bug 获取连接器key

Signed-off-by: AE86 <836391306@qq.com>

dbsyncer-connector/src/main/java/org/dbsyncer/connector/es/ESConnector.java

@@ -87,7 +87,7 @@ public final class ESConnector extends AbstractConnector implements Connector<ES
 
     @Override
     public String getConnectorMapperCacheKey(ESConfig config) {
-        return String.format("%s-%s-%s-%", config.getConnectorType(), config.getUrl(), config.getIndex(), config.getUsername());
+        return String.format("%s-%s-%s-%s", config.getConnectorType(), config.getUrl(), config.getIndex(), config.getUsername());
     }
 
     @Override