2.9 will include search by author. Documentation changes will be needed for the search macro, the search screen and the search RPC service.
The only one implemented so far is the RPC search so the documentation here will need modified.
The table titled "Parameters for Limiting Search Results" needs a new entry something like -
|contributor||The original creator or any editor of Confluence content.||any Confluence user's username||no filter by contributor|
- is caused by
CONFSERVER-2328 Enable user to search content by author/editor