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Why do I need a search engine? Search is everywhere. We use Google to find websites, we search for products in Amazon, we use keywords to find videos on Youtube, etc. From the consumer side, it’s a great way to get the information we need quickly. From the producer side, it means that we need to make sure we provide this interface the users have come to expect. Relational or document databases allow us to create indices and find pieces of information based on ids, but they don’t work for searchi...