It would be great to see full-text search in 1:1 and Group channels.
Yes, this feature is in EAP (early access program) now as of April, 2 2020 and it is a premium feature. Would you like to sign up to adopt this feature? Please contact sales through sales form to be in touch with this feature.
If you already have a point of contact for our sales team, please do so.
If not, you can do it quickly here