String dependencyTemplate(V version) {
    return beginTemplate(TYPE_DEPENDENCY, version)
      + "  },\n"
      + "  \"mappings\": {\n"
      + maybeWrap(TYPE_DEPENDENCY, version, "    \"enabled\": false\n")
      + "  }\n"
      + endTemplate(version);
  }
Templatized due to version differences. Only fields used in search are declared
zipkin-storage/elasticsearch/src/main/java/zipkin2/elasticsearch/VersionSpecificTemplates.java