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Metric aggregations compute summary numbers over all documents that matched your filter. Use metrics when you want one value (or stats object), not grouped buckets.

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Available Operators

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Input Format

Every metric operator takes an object with at least a field property:
The field value must be a string pointing to a FAST field in your schema.

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Behavior Notes

  • Metric operators require a field.
  • The field must be FAST in your schema.
  • Metric operators do not support nested $aggs.
  • For many metric operators, missing lets you provide a fallback value for documents where the field does not exist.