@Test void templatePriority_null() {
    TestPropertyValues.of(
      "zipkin.storage.type:elasticsearch",
      "zipkin.storage.elasticsearch.template-priority:")
      .applyTo(context);
    Access.registerElasticsearch(context);
    context.refresh();

    assertThat(es()).extracting("templatePriority")
      .isNull();
  }
Ensures we can wire up network interceptors, such as for logging or authentication
zipkin-server/src/test/java/zipkin2/server/internal/elasticsearch/ZipkinElasticsearchStorageConfigurationTest.java