# Lucene 8.6.3 backward-codecs API

Codecs for reading indexes from older versions of Lucene.

See: Description

Packages
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.lucene60: Lucene 6.0 file format.
org.apache.lucene.codecs.lucene70: Components from the Lucene 7.0 index format.
org.apache.lucene.codecs.lucene80: Lucene 8.0 file format.
org.apache.lucene.codecs.lucene84: Lucene 8.4 file format.

Codecs for reading indexes from older versions of Lucene.