elasticsearch/docs/reference/migration/migrate_8_0/watcher.asciidoc

[discrete]
[[breaking_80_watcher_changes]]
==== Watcher changes

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

//tag::notable-breaking-changes[]
.Watcher history now writes to a hidden data stream.
[%collapsible]
====
*Details* +
In 8.x, {es} writes Watcher history to a hidden
`.watcher-history-<index-template-version>` data stream. Previously, {es} wrote
Watcher history to hidden
`.watcher-history-<index-template-version>-<yyyy-MM-dd>` indices.

*Impact* +
Update your requests to target the Watcher history data stream. For example, use
the `.watcher-history-*` wildcard expression. Requests that specifically target
non-existent Watcher history indices may return an error.
====
// end::notable-breaking-changes[]