}
        return get("elasticsearch.password");
    }

    Integer getAsInteger(String propertyKey);

    Integer getSearchEngineHeartbeatIntervalAsInteger();

    default long getFesenHeartbeatInterval() {
        Integer value = getSearchEngineHeartbeatIntervalAsInteger();
        if (value != null) {
            return value.longValue();
        }

     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     * @throws NumberFormatException When the property is not integer.
     */
    Integer getSearchEngineHeartbeatIntervalAsInteger();

    /**
     * Get the value for the key 'app.cipher.algorism'. <br>
     * The value is, e.g. aes <br>
     * comment: Cipher algorithm used for encryption.