Getting the document number (with IndexReader)

[Chun Wei Ho]

I am attempting to prune an index by getting each document in turn and
then checking/deleting it:

IndexReader ir = IndexReader.open(path);
for(int i=0;i<ir.numDocs();i++) {
        Document doc = ir.document(i);
        if(thisDocShouldBeDeleted(doc)) {
                ir.delete(docNum); // <- I need the docNum for doc.
        }
}

How do I get the docNum for IndexReader.delete() function in the above
case? Is there a API function I am missing? I am working with a merged
index over different segments so the docNum might not be in running
sequence with the counter i.

In general, is there a better way to do this sort of thing?

Thanks!

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