https://pizza.rs/tags/rare_terms/Recent content in Rare_terms on INFINI PizzaHugoenhttps://pizza.rs/docs/references/aggregation/bucket/rare-terms/Mon, 01 Jan 0001 00:00:00 +0000https://pizza.rs/docs/references/aggregation/bucket/rare-terms/<h1 id="rare-terms-aggregation"> Rare terms aggregation <a class="anchor" href="#rare-terms-aggregation">#</a> </h1> <p>A multi-bucket aggregation that keeps only RARE terms — bucket keys whose document count is at or below <code>max_doc_count</code>. The mirror image of <a href="https://pizza.rs/docs/references/aggregation/bucket/terms/"><code>terms</code></a> for finding the long tail: instead of the top-N most frequent values, it returns every low-frequency value.</p> <h2 id="how-it-works"> How it works <a class="anchor" href="#how-it-works">#</a> </h2> <p>Bucketing works exactly like <a href="https://pizza.rs/docs/references/aggregation/bucket/terms/"><code>terms</code></a>: one bucket per unique value of <code>field</code>, multi-valued fields counted per element, and documents without the field either skipped or folded into a <code>missing</code> bucket. <code>include</code>/<code>exclude</code> filter candidate keys up front (exact-value arrays or a single wildcard string <code>prefix*</code> / <code>*suffix</code>).</p>