/** The key of the configuration. e.g. true */
    String RESPONSE_HIGHLIGHT_content_title_ENABLED = "response.highlight.content_title.enabled";

    /** The key of the configuration. e.g. application/pdf,text/plain */
    String RESPONSE_INLINE_MIMETYPES = "response.inline.mimetypes";

    /** The key of the configuration. e.g. fess.search */
    String INDEX_DOCUMENT_SEARCH_INDEX = "index.document.search.index";

    /** The key of the message: iBooks */
    public static final String LABELS_facet_filetype_ibooks = "{labels.facet_filetype_ibooks}";

    /** The key of the message: Plain Text */
    public static final String LABELS_facet_filetype_txt = "{labels.facet_filetype_txt}";

    /** The key of the message: Rich Text Format */