Setting for enhanced search send to background throws error definition for key is missing

[liza-mae]

Kibana version: 8.0.0-SNAPSHOT, 7.12.0-SNAPSHOT

Elasticsearch version: 8.0.0-SNAPSHOT, 7.12.0-SNAPSHOT

Server OS version: Ubuntu

Original install method (e.g. download page, yum, from source, etc.):
Snapshots

Description of the problem including expected versus actual behavior:
Getting a fatal error trying to set xpack.data_enhanced.search.sendToBackground.enabled: true. It appeared to have been implemented here: #83073 and we recently added to testing, it is throwing a fatal error though. Was this setting removed or updated or is it just missing key validation? Note, the setting works in 7.11.0.?

Steps to reproduce:

1. Install ES and Kibana
2. Set xpack.data_enhanced.search.sendToBackground.enabled: true in kibana.yml
3. Start ES and Kibana
4. Notice Kibana fails with fatal error

Provide logs and/or server output (if relevant):

 FATAL  Error: [config validation of [xpack.data_enhanced].search.sendToBackground]: definition for this key is missing

[elasticmachine]

Pinging @elastic/kibana-app-services (Team:AppServices)

[Dosant]

@liza-mae, this setting was renamed to
from xpack.data_enhanced.search.sendToBackground.enabled to xpack.data_enhanced.search.sessions.enabled
in #88023 following up on #87500.
Sorry for the inconvenience.

this rename and other work on this feature isn't backported to 7.11 because we plan to release it in 7.12.

[liza-mae]

Thanks @Dosant - I renamed the setting in 8.0 and 7.12.