ErrorWriter Policy config

[potehvad]

I have a custom ErrorWriterPolicy.
I put a parameter in config.json file, like this:
"apiman-gateway": { "writers": { "error": { "class": "plugin:com.test.apiman.plugins:apiman-plugins-failure-error-policy:2.1.0.Final/com.test.apiman.plugins.failure_error_plugin.PolicyErrorWriter", "config": { "useTransactionStatus": "false" } }, } },
This parameter is not handled by plugin.
I have investigated a source code and can not understand
//https://github.com/apiman/apiman/blob/master/gateway/platforms/vertx3/vertx3/src/main/java/io/apiman/gateway/platforms/vertx3/common/config/VertxEngineConfig.java#L222 public Map<String, String> getPolicyErrorWriterConfig() { return getConfig(config, GatewayConfigProperties.ERROR_WRITER_CLASS); }
GatewayConfigProperties.ERROR_WRITER_CLASS = "apiman-gateway.writers.error"

but later
//https://github.com/apiman/apiman/blob/master/gateway/platforms/vertx3/vertx3/src/main/java/io/apiman/gateway/platforms/vertx3/common/config/VertxEngineConfig.java#L380 return toFlatStringMap(obj.getJsonObject(prefix, new JsonObject()).getJsonObject(GATEWAY_CONFIG));
getJsonObject accepts a map key, not composite map key with dots...

Apiman version 2.1.0 on vert.x

How can I set up config for error writer policy plugin?