@NotNull
    @JsonPropertyDescription("The templated relative sub-path of path. " +
                             "The default path template is '" + PathTemplateConfig.DATE_AND_FEED_TEMPLATE + "'. " +
                             "Cannot be an absolute path and must resolve to a descendant of path.")
    @JsonProperty
    public PathTemplateConfig getSubPathTemplate() {
        return subPathTemplate;
    }
The template to create subdirectories within the 'path' directory.
The default value is <code>${year}${month}${day}/${feed}</code>
Must be a relative path.
stroom-proxy/stroom-proxy-app/src/main/java/stroom/proxy/app/handler/ForwardFileConfig.java