Hi there,

I am currently updating an old project that was based on Apache Lucene 4.6.0. 
The project used a DuplicateFilter to filter search results with the following 
code:

TopDocs docs = searcher.search(query, new DuplicateFilter(field), 
Integer.MAX_VALUE, new Sort(new SortField(sortField, Type.STRING)));

However, I noticed in the release notes for Lucene 7.0.0 that the 
DuplicateFilter has been removed and that DiversifiedTopDocsCollector should be 
used instead. Unfortunately, I am having difficulty understanding how to use 
DiversifiedTopDocsCollector and have been unable to find comprehensive 
documentation on it.

Could anyone provide guidance or an example of how to implement a filter 
similar to the old DuplicateFilter using DiversifiedTopDocsCollector?

Thank you for your assistance!

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