I think you want to access the TermEnum from IndexReader's terms() method.
Depending upon how many fields you have an which ones you're interested in
for term frequencies, something like this should get you started:
String dir = "topleveldir";
IndexReader ir = new IndexReader(FSDirectory.getDirectory(new File(dir),
false));
TermEnum terms = ir.terms();
while (terms.next()) {
System.out.printf("%s: %d\n", terms.term().text(), terms.docFreq());
}
terms.close();
ir.close();
I've glossed over a bunch of error handling and what to do if you want
frequency information from only one field of an index that has several, but it
should be enough to get you started.
BTW, you might want to generate the javadocs for the Lucene classes if you're
going to be delving in like this.
Good luck!
--MDC
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