private Optional<Object> getRawValue(String key) {
    if (key == null) {
      throw new NullPointerException("Key must not be null.");
    }

    synchronized (this.confData) {
      return Optional.ofNullable(this.confData.get(key));
    }
  }
Removes given config option from the configuration.

@param configOption config option to remove
@param <T> Type of the config option
@return true is config has been removed, false otherwise
amoro-common/src/main/java/org/apache/amoro/config/Configurations.java