9.5 Migrating from nnir

Gnus’ previous search engine was called nnir, and is obsolete as of Emacs version 28. If you’ve upgraded Emacs and are now getting obsolete-variable warnings about nnir-* variables, migration is fairly straightforward. In addition to the variables raised by the warnings, all previous engine-specific variables can be updated by simply replacing the nnir- prefix with gnus-search-. For instance, nnir-notmuch-program is now gnus-search-notmuch-program.