Optional<ConfigProperty> getGlobalProperty(final PropertyPath propertyPath) {
        Objects.requireNonNull(propertyPath);
        return Optional.ofNullable(globalPropertiesMap.get(propertyPath));
    }
@return True if fullPath is a valid path to a config value
stroom-config/stroom-config-global-impl/src/main/java/stroom/config/global/impl/ConfigMapper.java