@Test void version2_unsupported() {
    assertThatThrownBy(() -> storage.versionSpecificTemplates(V2_4))
      .hasMessage("Elasticsearch versions 5-8.x are supported, was: 2.4");
  }
Unsupported, but we should test that parsing works
zipkin-storage/elasticsearch/src/test/java/zipkin2/elasticsearch/ElasticsearchSpecificTemplatesTest.java