@Override
    public void close() throws IOException {
        //delete tmp dir or whatever here
    }
For now, this is an in-memory EmbeddedDocumentBytesHandler that stores
all the bytes in memory. Users can retrieve the documents with {@link #getDocument(int)}.

We'll need to make this cache to disk at some point if there are many bytes of
embedded documents.
tika-core/src/main/java/org/apache/tika/extractor/BasicEmbeddedDocumentBytesHandler.java