# Lucene 8.5.1 backward-codecs API

Codecs for reading indexes from older versions of Lucene.

See: Description

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.

Codecs for reading indexes from older versions of Lucene.

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