@Override
    public void close() {
        try {
            httpClient.close();
        } catch (Exception e) {
            logger.log(Level.WARNING, "Failed to close CloseableHttpClient", e);
        }
    }
A thread-unsafe /state/v1/health endpoint client.

@author hakonhall
service-monitor/src/main/java/com/yahoo/vespa/service/health/StateV1HealthClient.java