The document discusses how different technologies like Hadoop, Storm, Solr, and D3 can be integrated to build a real-time search and recommendation system. It provides examples of how unprocessed data can be stored in Hadoop and indexed by Storm and Solr in real-time to power a search engine. User queries, clicks, and engagement data would then be analyzed to update the search index and provide personalized recommendations. Visualizations from usage data could also be generated in real-time using D3 and node.js.