@Test void searchDisabled_doesntIndex() {
    consumer = spanConsumer(CassandraStorage.newBuilder().searchEnabled(false));

    Span span = spanWithoutAnnotationsOrTags.toBuilder()
      .addAnnotation(TODAY * 1000L, "annotation")
      .putTag("foo", "bar")
      .duration(10000L)
      .build();

    assertThat(consumer.accept(List.of(span)))
      .extracting("input.annotation_query")
      .satisfies(q -> assertThat(q).isNull());
  }
To allow lookups w/o a span name, we index "". "" is used instead of null to avoid creating
tombstones.
zipkin-storage/cassandra/src/test/java/zipkin2/storage/cassandra/CassandraSpanConsumerTest.java