Get index detail

curl --request GET \
  --url https://your-rootprint-host/api/indexes/{indexId} \
  --cookie better-auth.session_token=

{
  "indexId": "<string>",
  "displayName": "<string>",
  "levelField": "<string>",
  "messageField": "<string>",
  "tracebackField": "<string>",
  "contextFields": [
    "<string>"
  ],
  "fields": [
    {
      "name": "<string>",
      "type": "<string>",
      "fast": true
    }
  ],
  "sources": [
    {
      "sourceId": "<string>",
      "sourceType": "<string>",
      "enabled": true
    }
  ]
}