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Error message

{context}: properties list must not be empty

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When this error occurs

The properties array configures stats for named children of an object node. If you include properties, it must have at least one entry. An empty array is ambiguous — it could mean “no stats for any children” (in which case you should remove properties entirely) or be an accidental omission.

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Example: request that triggers this error

{
  "defaults": {
    "enabled_stats": ["value_count"]
  },
  "refresh": { "trigger": "manual" },
  "dataset": {
    "fields": [
      {
        "field_name": "address",
        "properties": []
      }
    ]
  }
}

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How to fix

Either add property entries or remove the properties field: Option A: Add property configurations 
{
  "field_name": "address",
  "properties": [
    {
      "path": "city",
      "enabled_stats": ["value_count", "approx_count_distinct"]
    }
  ]
}
Option B: Use self only (no child stats) 
{
  "field_name": "address",
  "self": {
    "enabled_stats": ["null_value_count"]
  }
}
Option C: Inherit from defaults (no-op field entry) 
{
  "field_name": "address"
}