@Test void dailyIndexFormat_overridingPrefix() {
    TestPropertyValues.of(
      "zipkin.storage.type:elasticsearch",
      "zipkin.storage.elasticsearch.hosts:http://host1:9200",
      "zipkin.storage.elasticsearch.index:zipkin_prod")
      .applyTo(context);
    Access.registerElasticsearch(context);
    context.refresh();

    assertThat(es().indexNameFormatter().formatTypeAndTimestamp("span", 0))
      .isEqualTo("zipkin_prod*span-1970-01-01");
  }
Ensures we can wire up network interceptors, such as for logging or authentication
zipkin-server/src/test/java/zipkin2/server/internal/elasticsearch/ZipkinElasticsearchStorageConfigurationTest.java