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https://issues.apache.org/jira/browse/LUCENE-778?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12465403
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Michael McCandless commented on LUCENE-778:
-------------------------------------------

One reason is because "Lucene controls the construction of Documents from Hits":

    http://www.gossamer-threads.com/lists/lucene/java-dev/31447

This issue periodically comes up, eg:

    http://www.gossamer-threads.com/lists/lucene/java-dev/32733

And there was at least this [closed, unresolved] issue from the past:

    http://issues.apache.org/jira/browse/LUCENE-358

> Allow overriding a Document
> ---------------------------
>
>                 Key: LUCENE-778
>                 URL: https://issues.apache.org/jira/browse/LUCENE-778
>             Project: Lucene - Java
>          Issue Type: New Feature
>    Affects Versions: 2.0.0
>            Reporter: Nicolas Lalevée
>            Priority: Trivial
>
> In our application, we have some kind of generic API that is handling how we 
> are using Lucene. The different other applications are using this API with 
> different semantics, and are using the Lucene fields quite differently. We 
> wrote some usefull functions to do this mapping. Today, as the Document class 
> cannot be overriden, we are obliged to make a document wrapper by 
> application, ie some MyAppDocument and MyOtherAppDocument which have a 
> property holding a real Lucene Document. Then, when MyApp or MyOtherApp want 
> to use our generic lucene API, we have to "get out" the Lucene document, ie 
> do some genericLuceneAPI.writeDoc(myAppDoc.getLuceneDocument()). This work 
> fine, but it becomes quite tricky to use the other function of our generic 
> API which is genericLuceneAPI.writeDocs(Collection<Document> docs).
> I don't know the rational behind making final Document, but removing it will 
> allow more object-oriented code.

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