rbowen opened a new pull request, #318:
URL: https://github.com/apache/incubator-ponymail-foal/pull/318

   The significant_terms aggregation can surface common English stopwords and 
email-specific noise (re, fwd, by) because on mailing lists these terms are 
frequent in both foreground and background sets. Filter the returned buckets 
against a stopword set and drop terms shorter than 3 characters.
   
   Proposed fix for #196


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