1. A system, comprising: a computing device; and a search interface component executable by the computing device, wherein the search interface component, when executed by the computing device, is configured to cause the computing device to at least: obtain a search query from a search component; validate the search query in response to an authentication of a key associated with the search component; search a search index for first application content that corresponds to the search query and second application content that corresponds to the search query, wherein the first application content is secured within a first sandbox for a first application and the second application content is secured within a second sandbox for a second application; and provide at least one search result to the search component, wherein the at least one search result is based at least in part on the first application content that corresponds to the search query or the second application content that corresponds to the search query.