code: private void initIndex() throws Exception {
  
          //0. Add the tasklog template
          if (doesResourceNotExist("/_template/tasklog_template")) {
              logger.info("Creating the index template 'tasklog_template'");
              InputStream stream = ElasticSearchDAOV5.class.getResourceAsStream("/template_tasklog.json");
              byte[] templateSource = IOUtils.toByteArray(stream);
  
              HttpEntity entity = new NByteArrayEntity(templateSource, ContentType.APPLICATION_JSON);
              try {
                  elasticSearchAdminClient.performRequest(HttpMethod.PUT, "/_template/tasklog_template", Collections.emptyMap(), entity);
              } catch (IOException e) {
                  logger.error("Failed to initialize tasklog_template", e);
              }
          }
      }
docs: Initializes the index with the required templates and mappings.