Lucene used to have a DuplicateFilter to do this, but we removed it
recently ... see for
some discussion as to why.

Mike McCandless

On Thu, Dec 1, 2016 at 2:39 PM, Matt Hicks <> wrote:
> I'm trying to write a LeafCollector that filters out duplicates for a
> specific field. However, looking at the JavaDoc for `collect` it says not
> to call `IndexSearch.doc` or `IndexReader.document`.  How am I supposed to
> determine the value of a field and then exclude it?

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