The disclosed computer-implemented method for enabling search services to highlight documents may include (1) creating, via an internal search service, a highlight index that comprises an analyzer for at least one type of document, (2) receiving a search query configured for an external search service and a document that is of the type and that comprises a search result for the search query, (3) querying the highlight index in order to retrieve the analyzer for the type of document from the highlight index, and (4) sending the analyzer, the document, and the search query to a search service in order to enable the search service to display at least one highlighted string extracted from the document via the analyzer, wherein the highlighted string originates from the search query. Various other methods, systems, and computer-readable media are also disclosed.