[DOC] Add experimental disclaimer to rollup jobs (elastic#95624) (ela…

…stic#102562)

Co-authored-by: James Rodewig <40268737+jrodewig@users.noreply.github.com>
Co-authored-by: Kibana Machine <42973632+kibanamachine@users.noreply.github.com>

Co-authored-by: François-Clément Brossard <renshuki@users.noreply.github.com>
Co-authored-by: Kibana Machine <42973632+kibanamachine@users.noreply.github.com>

docs/management/rollups/create_and_manage_rollups.asciidoc

@@ -2,6 +2,7 @@
 [[data-rollups]]
 == Rollup Jobs
 
+experimental::[]
 
 A rollup job is a periodic task that aggregates data from indices specified
 by an index pattern, and then rolls it into a new index. Rollup indices are a good way to