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The Rules Engine menu bar option is normally not visible. To visualize it, add the URL key-value pair se=1 to the end of the URL as shown here (the key-value pair has to be preceded by a ? or a &):
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Below we have superimposed our architecture graphics from above upon the Rules Engine UI to drive home the point that the Rules Engine consists of two separate rules set, one for the index side that is carried out before the documents are indexed, and another one for the search side that is carried out before the result is passed on to the end user:
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