Multisite WP_Query and search functionality
The title pretty much covers it, There is no way to query the posts from the entire multisite, and no way to search on the entire multisite. A feature that lets users wp_query with the same single-site wordpress rules and a search would be amazing for a lot of people and companies using wordpress multisite that I've come across.
The network is intended to be multiple separate sites, hence this not being by design.
The best you could do would be to use WordPress MU Sitewide Tags (a plugin) and aggregate all the posts so you could search that. Otherwise you're joining tables for searches, and that's never fast nor efficient.
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