@Override
    public HttpRequest get(final String name) {
        return HttpRequest.builder()
                          .get("/_template/{name}")
                          .pathParam("name", name)
                          .build();
    }
This request factory is about legacy index templates, which are deprecated and will be replaced
by the composable templates introduced in Elasticsearch 7.8. For information about composable
templates, see Index templates, https://www.elastic.co/guide/en/elasticsearch/reference/current/index-templates.html
oap-server/server-library/library-elasticsearch-client/src/main/java/org/apache/skywalking/library/elasticsearch/requests/factory/v6/V6TemplateFactory.java