Hello all, as the migration from FAST to Solr is a relevant topic for several of our customers, there is one issue that does not seem to be addressed by Lucene/Solr: document vectors FAST-style. These document vectors are used to form metrics of similarity, i.e., they may be used as a "semantic fingerprint" of documents to define similarity relations. I can think of several ways of approximating a mapping of this mechanism to Solr, but there are always drawbacks - mostly performance-wise.
Has anybody else encountered and possibly approached this challenge so far? Is there anything in the roadmap of Solr that has not revealed itself to me, addressing this issue? Your input is greatly appreciated! Cheers, --Jürgen
