The supporting classes for Lucene were written 5 years ago when it was impossible to do large queries (due to TooManyClausesException) and the support had to implement these queries by low level IndexReader API. Current lucene implements the standard queries using FilterQuery over IndexReader (similar to NB support). The support should be migrated to use these new API. This task also requires measurements of performance impact.
ALready integrated into jet-main.