.addInitialSettings("custom.key1", "value1")
                .addInitialSettings("custom.key2", 42)
                .scrollTimeout("100s")
                .searchTimeout("50s")
                .indexTimeout("200s")
                .bulkTimeout("300s")
                .indicesTimeout("150s")
                .clusterTimeout("250s");

        SuggestSettings settings = builder.build(client, id);

     */
    private void validateRequest(final FTPClient client) {
        final int replyCode = client.getReplyCode();
        if (replyCode >= 200 && replyCode < 300) {
            return;
        }
        throw new CrawlingAccessException("Failed FTP request: " + client.getReplyString().trim());
    }

    /**
     * Determines the character set for the given file.