From http://ilps.science.uva.nl/resources/bahasa

Information Retrieval Resources for Bahasa Indonesia

To support document retrieval in Bahasa Indonesia, we are making available a Porter
 stemmer for the language, a stop word list, as well as two document collections, 
together with topics and qrels for those topics: the Kompas online collection and 
the Tempo online collection.

Details about the development of those resources and their usage for evaluation 
purposes can be found in the following publications:

    * F.Z. Tala, A Study of Stemming Effects on Information
      Retrieval in Bahasa Indonesia, M.Sc. Thesis, University of
      Amsterdam, 2003
    * F. Tala, J. Kamps, K. Mller, and M. de Rijke. The Impact of 
      Stemming on Information Retrieval in Bahasa Indonesia (Abstract).
      In: 14th Meeting of Computational Linguistics in the Netherlands 
      (CLIN-2003), 2003.

If you use these resources, please let us know. If you publish results obtained 
using the resources made available here, please cite the Tala, Kamps, Mller and 
de Rijke paper listed above.