[discrete]
[[breaking_80_threadpool_changes]]
=== Thread pool changes

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

//tag::notable-breaking-changes[]
//end::notable-breaking-changes[]

.The `fixed_auto_queue_size` thread pool type has been removed.
[%collapsible]
====
*Details* +
The `fixed_auto_queue_size` thread pool type, previously marked as an
experimental feature, was deprecated in 7.x and has been removed in 8.0.
The `search` and `search_throttled` thread pools have the `fixed` type now.

*Impact* +
No action needed.
====