}
        final String authorities = fessConfig.getFesenHttpSslCertificateAuthorities();
        if (StringUtil.isNotBlank(authorities)) {
            builder.put("http.ssl.certificate_authorities", authorities);
        }
        return new HttpClient(builder.build(), null);
    }

        final String authorities = fessConfig.getFesenHttpSslCertificateAuthorities();
        if (StringUtil.isNotBlank(authorities)) {
            if (logger.isDebugEnabled()) {
                logger.debug("Loading certificate_authorities: {}", authorities);
            }
            try (final InputStream in = new FileInputStream(authorities)) {
                final Certificate certificate = CertificateFactory.getInstance("X.509").generateCertificate(in);

#
# The title of domain the application for logging
domain.title = Fess

# Search Engine
search_engine.type=default
search_engine.http.url=http://localhost:9201
search_engine.http.ssl.certificate_authorities=
search_engine.username=
search_engine.password=
search_engine.heartbeat_interval=10000

# Cryptographer
app.cipher.algorism=aes
app.cipher.key=___change__me___
app.digest.algorism=sha256

        final String value = getSearchEngineHttpSslCertificateAuthorities();
        if (value != null) {
            return value;
        }
        return get("elasticsearch.http.ssl.certificate_authorities");
    }

    String getSearchEngineUsername();

    default String getFesenUsername() {
        final String value = getSearchEngineUsername();
        if (value != null) {

        }
        final String authorities = fessConfig.getFesenHttpSslCertificateAuthorities();
        if (StringUtil.isNotBlank(authorities)) {
            builder.put("http.ssl.certificate_authorities", authorities);
        }
        return new HttpClient(builder.build(), null);
    }

    public boolean existsIndex(final String indexName) {

     * Get the value for the key 'search_engine.http.ssl.certificate_authorities'. <br>
     * The value is, e.g.  <br>
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getSearchEngineHttpSslCertificateAuthorities();

    /**
     * Get the value for the key 'search_engine.http.ssl.certificate_authorities' as {@link Integer}. <br>
     * The value is, e.g.  <br>