I believe it is complaining about this:

*public void addIndexBackendOptions(Configuration conf) {
        LuceneWriter.addFieldOptions(MP3_TRACK_TITLE,
LuceneWriter.STORE.YES, LuceneWriter.INDEX.TOKENIZED, conf);
        LuceneWriter.addFieldOptions(MP3_ALBUM, LuceneWriter.STORE.YES,
LuceneWriter.INDEX.TOKENIZED, conf);
        LuceneWriter.addFieldOptions(MP3_ARTIST, LuceneWriter.STORE.YES,
LuceneWriter.INDEX.TOKENIZED, conf);
        LuceneWriter.addFieldOptions(MP3_GENRE, LuceneWriter.STORE.YES,
LuceneWriter.INDEX.TOKENIZED, conf);
        LuceneWriter.addFieldOptions(MP3_RELEASE_DATE,
LuceneWriter.STORE.YES, LuceneWriter.INDEX.TOKENIZED, conf); *

You no longer need to do this in your plugin.

Instead you would replace with something like this:

private static final String MP3_TRACK_TITLE = "track_title"; 

public NutchDocument filter(NutchDocument doc, Parse parse, Text url,
    CrawlDatum datum, Inlinks inlinks) throws IndexingException { 

  doc.add(MP3_TRACK_TITLE, "title_for_this_track_goes_here");

}

basically don't use any of the LuceneWriter classes



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