String indexTemplate(V version) {
    if (useComposableTemplate(version)) {
      return "\"template\": {\n";
    }

    return "";
  }
In Zipkin search, we do exact match only (keyword). Norms is about scoring. We don't use that
in our API, and disable it to reduce disk storage needed.
zipkin-storage/elasticsearch/src/main/java/zipkin2/elasticsearch/VersionSpecificTemplates.java