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Does it use a full-text searching engine like Lucene or does it use other data mining tools? I have a some xml data residing in a native xml database and am looking for ways to present to the user that this question (or parts of it) may have already been answered in a different question.

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related (dupe?) Which tools and technologies are used to build the Stack Exchange Network? (as of now, there's nothing about search there though) – gnat Feb 12 '13 at 16:38
up vote 5 down vote accepted

We use ElasticSearch - we used to use Lucene.NET.

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Why isn't stackexchange featured? elasticsearch.org/users – Jasjeev Singh Feb 12 '13 at 16:05
    
@JasjeevSingh - Ask them... We have just started using it - this is a fairly new development. – Oded Feb 12 '13 at 16:07
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<pedantic>ElasticSearch also uses Lucene.</pedantic> – Charles Feb 12 '13 at 18:08

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