Config - HOCON mapped Map has keys detached with extra parent key

[danielkec]

Environment Details

• Helidon Version: 2,3,4
• Helidon SE

---

Problem Description

When mapping HOCON to object with Map field, map keys contains extra parent field name.

Steps to reproduce

@Data
public static class MetricsProducerConfig {
    private int sendTimeoutMillis;
    private Map<String, Object> properties;
}
...
var hocon =
          """
            sendTimeoutMillis: 4000
            properties: {
              "retries": 1
              "request.timeout.ms": 10000
              "delivery.timeout.ms": 30000
              "buffer.memory": 335544320
              "max.block.ms": 500
              "max.request.size": 10485760
            }
            """;
Config config = Config.builder(ConfigSources.create(hocon, MediaTypes.create("application/hocon")))
        .disableEnvironmentVariablesSource()
        .disableSystemPropertiesSource()
        .build();
MetricsProducerConfig mCfg = config
        .as(MetricsProducerConfig.class)
        .get();
System.out.println(String.join("\n", mCfg.getProperties().keySet()));

Yields:

properties.delivery.timeout.ms
properties.max.block.ms
properties.retries
properties.max.request.size
properties.request.timeout.ms
properties.buffer.memory