return -1;
}
RetrievalEnvironment env = new RetrievalEnvironment(indexPath, fs);
Path mappingFile = env.getDocnoMappingData();
new MedlineDocnoMappingBuilder().build(new Path(collection), mappingFile, conf);
conf.set(Constants.CollectionName, "Medline");
conf.set(Constants.CollectionPath, collection);
conf.set(Constants.IndexPath, indexPath);
conf.set(Constants.InputFormat, MedlineCitationInputFormat.class.getCanonicalName());