Google Merchant Center can be used to evaluate site search by exporting data from the global product catalog and importing it into Algolia's user-friendly drag and drop interface. This allows for a quick setup of a proof of concept (POC) without requiring coding skills. Algolia, which powers search and discovery for over 9,000 customers, offers a free trial signup at https://www.algolia.com/users/sign_up. Once data is indexed in Algolia, users can test basic search queries and explore additional features to enhance their site search experience.