The phrase "searchable form" means that something is organized and structured in a way that allows you to easily find specific information by using a search function or tool. Full definition
All of the data provided by the three companies should be provided in searchable form. (usatoday.com)
The parsing process then extracts the text and places it into a structured and more readily searchable form. (resources.careerbuilder.com)
Users can subscribe directly to feeds from sites they read regularly, though feed aggregators such as Google Reader and MyYahoo also collect feeds in searchable form. (epolitics.com)