Years ago when "Federated Search" was a buzzword we did some development and testing with Lucene, FAST Search, Google and several other Search Engines according Federated Search in Library context. The results can be found here http://pub.uni-bielefeld.de/download/2516631/2516644 Some minor parts are in German most is written in English. It also gives you an idea where to keep an eye on, where are the pitfalls and so on. We also had a tool called "unity" (written in Python) which did Federated Search on any Search Engine and Database, like Google, Gigablast, FAST, Lucene, ... The trick with Federated Search is to combine the results. We offered three options to the users search surface: - RoundRobin - Relevancy - PseudoRandom
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