adapter 远程配置

修改rdb热加载配置的问题

client-adapter/elasticsearch/src/main/java/com/alibaba/otter/canal/client/adapter/es/monitor/ESConfigMonitor.java

@@ -84,6 +84,10 @@ public class ESConfigMonitor {
                     // 加载配置文件
                     String configContent = MappingConfigsLoader
                         .loadConfig(adapterName + File.separator + file.getName());
+                    if (configContent == null) {
+                        onFileDelete(file);
+                        return;
+                    }
                     ESSyncConfig config = new Yaml().loadAs(configContent, ESSyncConfig.class);
                     config.validate();
                     if (esAdapter.getEsSyncConfig().containsKey(file.getName())) {