# Apache Lucene Migration Guide

## Separation of IndexDocument and StoredDocument (LUCENE-3312)

The API of oal.document was restructured to differentiate between stored 
documents and indexed documents. IndexReader.document(int) now returns 
StoredDocument instead of Document. In most cases a simple replacement
of the return type is enough to upgrade.

## Removed Reader from Tokenizer constructor (LUCENE-5388)

The constructor of Tokenizer no longer takes Reader, as this was a leftover
from before it was reusable. See the org.apache.lucene.analysis package
documentation for more details.