public AwsEc2Service(Settings settings, SettingsFilter settingsFilter, NetworkService networkService, DiscoveryNodeService discoveryNodeService) {
super(settings);
settingsFilter.addFilter(new AwsSettingsFilter());
// add specific ec2 name resolver
networkService.addCustomNameResolver(new Ec2NameResolver(settings));
discoveryNodeService.addCustomAttributeProvider(new Ec2CustomNodeAttributes(settings));
}