Codecs for reading indexes from older versions of Lucene.

Packages

Package	Description
org.apache.lucene.codecs	Common APIs for use by backwards compatibility codecs.
org.apache.lucene.codecs.lucene50	Lucene 5.0 file format.
org.apache.lucene.codecs.lucene70	Lucene 7.0 file format.
org.apache.lucene.codecs.lucene80	Lucene 8.0 file format.