curl --request GET \
  --url http://localhost:3000/api/v1/indices/{identifier} \
  --header 'Authorization: Bearer <token>'

{
  "index": {
    "id": "idx_omxs30abc",
    "name": "OMX Stockholm 30",
    "symbol": "OMXS30",
    "pan_nordic": false,
    "exchange": {
      "id": "<string>",
      "name": "<string>",
      "mic_code": "<string>"
    },
    "description": "<string>",
    "companies_count": 123
  }
}