curl --request GET \
  --url https://api.gcore.com/cloud/v1/laas/{project_id}/{region_id}/topics \
  --header 'Authorization: <api-key>'

{
  "index_pattern": {
    "id": "exampletopicindexpatternid"
  },
  "name": "mytopic",
  "retention_policy": {
    "period": 45
  },
  "size_in_bytes": 0
}