curl --request GET \
  --url https://api.streamkap.com/topics/details/grouped \
  --header 'Authorization: Bearer <token>'

{
  "result": [
    {
      "group_id": "<string>",
      "entity": {
        "entity_id": "<string>",
        "entity_type": "sources",
        "entity_name": "<string>",
        "connector": "elasticsearch",
        "connector_display_name": "<string>"
      },
      "topic_count": 123,
      "topics": {
        "result": [
          {
            "id": "<string>",
            "name": "<string>",
            "entity": {
              "entity_type": "sources",
              "entity_id": "<string>",
              "name": "<string>",
              "connector": "elasticsearch",
              "topic_ids": [
                "<string>"
              ],
              "topic_db_ids": [
                "<string>"
              ],
              "display_name": "<string>"
            },
            "prefix": "<string>",
            "serialization": {
              "key_format": "unknown",
              "value_format": "unknown",
              "key_converter": "<string>",
              "value_converter": "<string>",
              "schema_registry_enabled": false
            }
          }
        ],
        "page": 1,
        "page_size": 10,
        "total": 123,
        "has_next": true
      },
      "group_type": "entity_id"
    }
  ],
  "page": 1,
  "page_size": 10,
  "total": 123,
  "has_next": true
}