Get cluster overview

curl --request GET \
  --url https://example.com/api/admin/cluster \
  --cookie better-auth.session_token=

{
  "health": {
    "endpoint": "<string>",
    "healthy": true
  },
  "perIndex": [
    {
      "capturedAt": "<string>",
      "displayName": "<string>",
      "indexId": "<string>",
      "numDocs": 123,
      "numSplits": 123,
      "sizeBytes": 123,
      "uncompressedBytes": 123
    }
  ],
  "totals": {
    "indexCount": 123,
    "latestCapturedAt": "<string>",
    "totalDocs": 123,
    "totalSizeBytes": 123,
    "totalSplits": 123
  }
}