# Lucene 7.7.1 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.lucene53 | Components from the Lucene 5.3 index format See `org.apache.lucene.codecs.lucene53` for an overview of the index format.
org.apache.lucene.codecs.lucene54 | Lucene 5.4 file format.
org.apache.lucene.codecs.lucene60 | Lucene 6.0 file format.
org.apache.lucene.codecs.lucene62 | Lucene 6.2 file format.
org.apache.lucene.index | Tools for handling backwards compatibility issues with indices.

Codecs for reading indexes from older versions of Lucene.

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