});
                        writer.flush();
                    }
                });
            }
        }
        throwValidationError(messages -> messages.addErrorsCouldNotFindBackupIndex(GLOBAL), this::asListHtml);
        return redirect(getClass()); // no-op
    }

    private Path getDocJsonPath() {
        return ResourceUtil.getClassesPath("fess_indices", "fess", "doc.json");
    }

     * message: Could not find any backup index.
     * </pre>
     * @param property The property name for the message. (NotNull)
     * @return this. (NotNull)
     */
    public FessMessages addErrorsCouldNotFindBackupIndex(String property) {
        assertPropertyNotNull(property);
        add(property, new UserMessage(ERRORS_could_not_find_backup_index));
        return this;
    }

    /**