In Solr and ES this is done with faceting and aggregations,
respectively, based on Lucene's low-level APIs. Have you looked at
TermsEnum? You can use that to get all distinct terms for a segment,
and then it is up to you to coalesce terms across segments ("leaves").
On Thu, Nov 21, 2019 at 1:15 AM Amol Suryawanshi
<amol.suryawan...@qualitiasoft.com> wrote:
>
> 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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>
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