check out https://lucene.apache.org/core/9_5_0/core/org/apache/lucene/document/FeatureField.html
I think this is how you want to do it: it has some suggestions on how to start without training the actual values in the docs, see "if you don't know where to start" On Wed, Feb 1, 2023 at 12:03 PM Trevor Nicholls <tre...@castingthevoid.com> wrote: > > Hi > > > > I'm currently using Lucene 8-6.3, and indexing a few thousand documents. > Some of these documents need to be prioritised in the search results, but > not by too much; e.g. an exact phrase match in a normal document still needs > to top the rankings ahead of a priority document that just matches the > individual words. > > I'm tokenising and indexing a Title field and a Content field, and storing a > Category field and a Version field. Searches are executed with a standard > QueryParser on Title and Content. > > > > Most documents do not have a category or a version, but if a document has > the category ReleaseNote then it needs to be boosted, and the value of the > boost factor should be correlated with the Version (so Version = 10 is > boosted more than Version = 6, etc). > > > > Looking back through the older versions of the documentation it appears that > document.setBoost might have provided something I could work with, but later > versions of Lucene appear to have dropped this feature. If it still existed > I expect I'd have to experiment with the actual coefficients until I got > reasonable results but in principle it should be possible to arrive at a > good result. > > > > I can't see how to achieve this same thing in the later versions of Lucene. > Best I can come up with is to calculate a factor from the category and > version number and store it as a separate field, then somehow use this field > to scale up (or down) the actual scores reported for the query results. But > I'm sure there must be a better way to do it - can anyone show me what it > is? > > > > cheers > > T > > > --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
