Here are a few others:
- Better support for hits sorted by things other than score. An easy,
efficient case is to support results sorted by the order documents were
added to the index. A little harder and less efficient is support for
results sorted by an arbitrary field.
- Add ability to "boost" individual documents/fields. When a document is
indexed, a numeric "boost" value could be specified for the whole document,
and/or for individual fields. This value would be multipled into scores for
hits on this document. This would facilitate the implementation of things
like Google's pagerank.
- Add to FSDirectory the ability to specify where lock files live and to
disable the use of lock files altogether (for read-only media).
- Add some requested methods:
String[] Document.getValues(String fieldName);
String[] IndexReader.getIndexedFields();
void Token.setPositionIncrement(int);
Doug
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