Sorting search result in Lucene based on a numeric field

Question

I have some docs with two fields: text, count.

I\'ve used Lucene to index docs and now I want to search in text and get the result sorted by count in de

Answer 1

Below line will do the trick. Last parameter is boolean reverse if you set it to true it will sort in reverse order i.e. descending in your case.

  SortField longSort = new SortedNumericSortField(FIELD_NAME_LONG, SortField.Type.LONG, true);

Sample code:

  IndexSearcher searcher = new IndexSearcher(reader);
  Query q = new MultiFieldQueryParser(new String[] { FIELD_NAME_NAME}, analyzer).parse("YOUR_QUERY") );

  SortField longSort = new SortedNumericSortField(FIELD_NAME_LONG, SortField.Type.LONG, true);

  Sort sort = new Sort(longSort);
  ScoreDoc[] hits = searcher.search(q, 10 , sort).scoreDocs;

Also it's necessary that you add you sort enabled field as a NumericDocValuesField when you create your index.

 doc.add(new NumericDocValuesField(FIELD_NAME_LONG, longValue));//sort enabled field

Code is as per lucene-core-5.0.0