Get distinct fields values from lucene index

[Amol Suryawanshi]

Hello,

I am using lucene in my organization. I want to know how can I get distinct 
values from lucene index. I have tried “GroupingSearch” API but it doesn’t 
serves the purpose. It will give all documents contains distinct values. I have 
used below code.


final GroupingSearch groupingSearch = new GroupingSearch(groupField);

Sort sort  =  new Sort(new SortField(groupField, SortField.Type.STRING_VAL, 
false));
groupingSearch.setSortWithinGroup(sort);
Query query = new MatchAllDocsQuery();
TopGroups<BytesRef> topGroups = null;

try {
    topGroups = groupingSearch.search(searcher, query, 0, 10);
} catch (final IOException e) {
    System.out.println("Can't execute group search because of an IOException. 
"+ e);
}

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