final Builder builder = Settings.builder()
                .putList("http.hosts", hosts)
                .put("processors", fessConfig.getCrawlerHttpProcessors())
                .put("http.heartbeat_interval", fessConfig.getFesenHeartbeatInterval());
        final String username = fessConfig.getFesenUsername();
        final String password = fessConfig.getFesenPassword();

        Integer value = getSearchEngineHeartbeatIntervalAsInteger();
        if (value != null) {
            return value.longValue();
        }
        value = getAsInteger("elasticsearch.heartbeat_interval");
        if (value != null) {
            return value.longValue();
        }
        return 10000L;
    }

        final Builder builder = Settings.builder()
                .putList("http.hosts", hosts)
                .put("processors", fessConfig.availableProcessors())
                .put("http.heartbeat_interval", fessConfig.getFesenHeartbeatInterval());
        final String username = fessConfig.getFesenUsername();
        final String password = fessConfig.getFesenPassword();

    }

    // Test numeric conversions
    public void test_numericConversions() {
        // Test integer conversion
        Integer heartbeatInterval = fessConfig.getSearchEngineHeartbeatIntervalAsInteger();
        assertNotNull(heartbeatInterval);
        assertEquals(10000, heartbeatInterval.intValue());

        // Test integer conversion for cleanup days
        int cleanupDays = fessConfig.getDayForCleanup();