Dev Time: Looking at a Plaintext Lucene Index

Starting with Lucene 4 the format for these files can be configured using the Codec API. Several implementations are provided with the release, among those the SimpleTextCodec that can be used to write the files in plaintext for learning and debugging purposes.

To configure the Codec you just set it on the IndexWriterConfig:

StandardAnalyzer analyzer = new StandardAnalyzer(Version.LUCENE_40);  IndexWriterConfig config = new IndexWriterConfig(Version.LUCENE_40, analyzer);  // recreate the index on each execution  config.setOpenMode(IndexWriterConfig.OpenMode.CREATE);  config.setCodec(new SimpleTextCodec());

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