I am trying to get make user and channels links to work in slack notifications on elasticsearch/x-pack. I have tried using "markdwn": true and ""
  "actions": {
    "notify-slack": {
      "slack": {
        "message": {
          "mrkdwn": true,
          "to": "@brijesh",
          "text": "<!U0FMK07QC|brijesh> errors on test module",
          "dynamic_attachments": {
            "list_path": "ctx.payload.hits.hits",
            "attachment_template": {
              "title": "Error on {{_source.environment}} v{{_source.version}}",
              "text": "{{_source.message}}"
            }
          }
        }
      }
    }
I noticed such implementation being discussed here,
I wonder is this feature still not available in x-pack? Any workaround to make this work?
What I want to achieve is to be able to link users and channels mentioned in slack message to be linked and not just display as normal text.