[discrete]
[[breaking_80_aggregations_changes]]
=== Aggregations changes

//NOTE: The notable-breaking-changes tagged regions are re-used in the
//Installation and Upgrade Guide

//tag::notable-breaking-changes[]
[[percentile-duplication]]
.The `percentiles` aggregation's `percents` parameter no longer supports duplicate values.
[%collapsible]
====
*Details* +
If you specify the `percents` parameter with the
{ref}/search-aggregations-metrics-percentile-aggregation.html[`percentiles` aggregation],
its values must be unique. Otherwise, an exception occurs.

*Impact* +
Use unique values in the `percents` parameter of the `percentiles` aggregation.
Requests containing duplicate values in the `percents` parameter will return
an error.
====
// end::notable-breaking-changes[]