Rate aggregation

Rate aggregation #

A single-value metrics aggregation that reduces a numeric field inside date_histogram buckets (per-interval totals), intended for counters that accumulate over time.

How it works #

rate reads one field and reduces it per bucket, with three reduction modes selected by mode:

• sum (default) — the bucket’s total of the field; identical to sum.
• value_count — how many values the field has in the bucket.
• avg — the bucket’s mean of the field.

If field is omitted entirely, the aggregation counts the documents in the bucket (the value_count shape over _doc).