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What exactly is faceted search in the context of full-text search?
I even read about it from Wikipedia, but I couldn't completely understand the use/benefit of it. Hope the community can answer/expand and explain with some good examples.
NOTE: We're into the process of evaluating/researching different open source full-text search engine and mostly I'm seeing faceted search listed as one of the feature among others. So I'm trying to assess whether this would be helpful for our application requirement.
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Faceted search makes search results more relevant Facets offer a way to describe an aspect of a product or page. For instance, a facet can be an option for a product. If we go back to the iPhone example, a facet would be “black”, “gold” or “pink” as color. By offering faceted search.
Faceted search is technically a guided navigation which allows the users to narrow down their search results. It can be used in big directories (like an image library for example), but the most common use of this search feature is for eCommerce web shops / web stores.
Things that are faceted have many different sides or faces. The sparkling ruby in your grandmother's necklace is faceted. The adjective faceted is most often used to describe a gem or semi-precious stone that's been cut and polished.
Faceted search allows users to reduce the number of search results quickly to get to the desired item(s). Here is a complete guide on how to use it with Elasticsearch and Laravel PHP. We all know them, search pages which allow you to filter through vast data sets by checking or unchecking filters.
Faceted search is well-explained here and Lucene faceted through an example.
EXAMPLE: 
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Faceted (or navigational) search uses a hierarchy structure (taxonomy) to enable users to browse information by choosing from a pre-determined set of categories. This allows a user to type in their simple query, then refine their search options by navigating/drilling down. In reality, it's an advanced search going on in the background, but instead of the user having to think of the additional search categories, it's been made easier for them by the visible folder structure. Examples of this are eCommerce sites like Amazon and eBay.
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