https://pizza.rs/tags/reverse_nested/Recent content in Reverse_nested on INFINI PizzaHugoenhttps://pizza.rs/docs/references/aggregation/bucket/nested-agg/Mon, 01 Jan 0001 00:00:00 +0000https://pizza.rs/docs/references/aggregation/bucket/nested-agg/<h1 id="nested-aggregation"> Nested aggregation <a class="anchor" href="#nested-aggregation">#</a> </h1> <p>A single-bucket aggregation that scopes its sub-aggregations to a nested object path. Nested field values are addressable as dotted columns, so sub-aggregations read <code>variants.color</code> style fields directly — counting per array element where it matters, not per parent document.</p> <p><code>reverse_nested</code> (only valid inside a <code>nested</code> aggregation) jumps back out to the parent-document scope.</p> <h2 id="how-it-works"> How it works <a class="anchor" href="#how-it-works">#</a> </h2> <p>The engine returns a single bucket shaped <code>{ &quot;doc_count&quot;: &lt;parents&gt;, …sub-aggs }</code>. Sub-aggregations run over the parent documents, but the nested path&rsquo;s values live in multivalue dotted columns, so a <code>terms</code> on <code>variants.color</code> buckets every array ELEMENT: over the 30 teaching <code>products</code> with 60 variant elements, <code>black</code> / <code>white</code> / <code>blue</code> each collect 20. One exception is <a href="https://pizza.rs/docs/references/aggregation/metric/top-hits/"><code>top_hits</code></a>, which is element-level here: each hit is one stored element carrying <code>_nested: {field, offset}</code> identity, sorted per the requested sort.</p>