: > The fact that you need to index doc values is related to another change in : > which we removed Lucene's FieldCache and now recommend to use doc values : > instead. Until you reindex with doc values, you can temporarily use : > UninvertingReader[1] to have the same behaviour as in Lucene 4.x. : : Is indexing doc values vs. UninvertingReader a space/time tradeoff? Or : is the general recommendation to index doc values and only resort to an : UninvertingReader when a full 4.x to 5.x conversion is to costly in : terms of dev. hours?
Using docValues is going to be better for almost every use case -- it adds additional disk space (and some additional time spent building the index) but saves a large amount of RAM + time when opening IndexSearchers. It is essetnailly a more efficient, on disk, version of FieldCache constructed hwen building then index instead of "on the fly" the first time it's used. -Hoss http://www.lucidworks.com/ --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
