migrate to 4.9 - package analysis
migrate to 4.9 - package util
migrate to 4.9 - package util/automaton
migrate to 4.9 - package util/fst
migrate to 4.9 - package util/packed
migrate to 4.9 - package document
migrate to 4.9 - package store
migrate to 4.9 - package index, codec/lucene40, codec/lucene42
migrate to 4.9 - package codec/lucene41, codec/blocktree
migrate to 4.9 - package codec/compressing
extract package lucene40
migrate to 4.9 - package codec/perfield
migrate to 4.9 - package search
fix unit test for package store
fix unit test for package index
implement DefaultIndexChain.processDocument()
fix TermVectorsConsumer.startDocument()
implement DefaultIndexChain.fillStoredFields()
implement DefaultIndexingChain.startStoredFields()
fix DWFC.assertMemory()