# Lucene 5.5.5 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.blocktree | BlockTree terms dictionary from Lucene 4.0-4.10
org.apache.lucene.codecs.lucene40 | Lucene 4.0 file format.
org.apache.lucene.codecs.lucene41 | Lucene 4.1 file format.
org.apache.lucene.codecs.lucene410 | Lucene 4.10 file format.
org.apache.lucene.codecs.lucene42 | Lucene 4.2 file format.
org.apache.lucene.codecs.lucene45 | Lucene 4.5 file format.
org.apache.lucene.codecs.lucene46 | Lucene 4.6 file format.
org.apache.lucene.codecs.lucene49 | Lucene 4.9 file format.
org.apache.lucene.codecs.lucene50 | Lucene 5.0 file format.
org.apache.lucene.codecs.lucene53 | Lucene 5.3 file format.

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