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Error message

defaults: enabled_stats is required (no parent scope to inherit from)

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When this error occurs

The defaults object is the root of the inheritance chain. Every other level (namespace scope, field overrides, nested nodes) can optionally omit enabled_stats and inherit from its parent. But defaults has no parent — so enabled_stats must be explicitly provided. This error is raised when:
  • defaults contains only stat_options without enabled_stats
  • defaults is an empty object

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Example: request that triggers this error

{
  "defaults": {
    "stat_options": {
      "histogram": { "max_bins": 200 }
    }
  },
  "refresh": { "trigger": "manual" }
}
The server cannot determine which stats to compute because enabled_stats is missing from defaults.

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How to fix

Add enabled_stats to the defaults object. Even if you only want to configure histogram options, you must declare the stat set: 
{
  "defaults": {
    "enabled_stats": ["value_count", "null_value_count", "histogram"],
    "stat_options": {
      "histogram": { "max_bins": 200 }
    }
  },
  "refresh": { "trigger": "manual" }
}
To disable all stats globally, use an empty array: 
{
  "defaults": {
    "enabled_stats": []
  },
  "refresh": { "trigger": "manual" }
}