# All Packages

- Package Summary
  Package | Description
  --- | ---
  org.apache.lucene.backward_codecs | Common APIs for use by backwards compatibility codecs.
  org.apache.lucene.backward_codecs.compressing | Compressing helper classes.
  org.apache.lucene.backward_codecs.lucene40.blocktree | BlockTree terms dictionary.
  org.apache.lucene.backward_codecs.lucene50 | Lucene 5.0 file format.
  org.apache.lucene.backward_codecs.lucene50.compressing | Lucene 5.0 compressing format.
  org.apache.lucene.backward_codecs.lucene60 | Lucene 6.0 file format.
  org.apache.lucene.backward_codecs.lucene70 | Components from the Lucene 7.0 index format.
  org.apache.lucene.backward_codecs.lucene80 | Components from the Lucene 8.0 index format.
  org.apache.lucene.backward_codecs.lucene84 | Lucene 8.4 file format.
  org.apache.lucene.backward_codecs.lucene86 | Lucene 8.6 file format.
  org.apache.lucene.backward_codecs.lucene87 | Lucene 8.7 file format.
  org.apache.lucene.backward_codecs.lucene90 | Lucene 9.0 file format.
  org.apache.lucene.backward_codecs.lucene91 | Lucene 9.1 file format.
  org.apache.lucene.backward_codecs.lucene92 | Lucene 9.2 file format.
  org.apache.lucene.backward_codecs.lucene94 | Lucene 9.4 file format.
  org.apache.lucene.backward_codecs.lucene95 | Lucene 9.5 file format.
  org.apache.lucene.backward_codecs.packed | Legacy PackedInts methods
  org.apache.lucene.backward_codecs.store | store helper