Get index stats history

curl --request GET \
  --url https://example.com/api/indexes/{indexId}/stats \
  --cookie better-auth.session_token=

{
  "indexId": "<string>",
  "points": [
    {
      "capturedAt": "<unknown>",
      "maxTimestamp": 123,
      "minTimestamp": 123,
      "numDocs": 123,
      "numSplits": 123,
      "sizeBytes": 123,
      "uncompressedBytes": 123
    }
  ]
}