@Test void oneHealthy() {
    server1Health.setHealthy(false);

    try (ElasticsearchStorage storage = context.getBean(ElasticsearchStorage.class)) {
      assertOk(storage.check());
    }
  }
This ensures the response is sent after the request is fully read.
zipkin-server/src/test/java/zipkin2/server/internal/elasticsearch/ITElasticsearchHealthCheck.java