@Test void addsAutocompleteValue() throws Exception {
    server.enqueue(SUCCESS_RESPONSE);

    accept(Span.newBuilder().traceId("1").id("1").timestamp(1).putTag("environment", "A").build());

    assertThat(server.takeRequest().request().contentUtf8())
      .endsWith("""
        {"index":{"_index":"zipkin:autocomplete-1970-01-01","_type":"autocomplete","_id":"environment=A"}}
        {"tagKey":"environment","tagValue":"A"}
        """);
  }
Less overhead as a span json isn't rewritten to include a millis timestamp
zipkin-storage/elasticsearch/src/test/java/zipkin2/elasticsearch/ElasticsearchSpanConsumerTest.java