Table of Contents

Sorting

By default, IndexSearcher.Search returns hits ordered by relevance score.

Sort by field at query time

Use a sorted-search overload, supplying one or more SortField values:

using Rowles.LeanLucene.Search.Scoring;

var sort = new[]
{
    new SortField("price", SortFieldType.Double, descending: false),
    new SortField("id",    SortFieldType.String, descending: false),
};

var hits = searcher.Search(new TermQuery("category", "books"), 10, sort);

Sort field types include Score, String, Long, Int, Double, Float.

Index-time sort

Configure IndexSort on the writer to physically reorder documents within each segment as they are flushed. Query-time sorted searches still collect and order matching hits by the requested field.

var config = new IndexWriterConfig
{
    IndexSort = new IndexSort(
        new SortField("publishedAt", SortFieldType.Long, descending: true))
};

SortFieldType.Score is not allowed for IndexSort.

See also

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