Example usage for org.apache.lucene.search.similarities BM25Similarity getDiscountOverlaps

Introduction

In this page you can find the example usage for org.apache.lucene.search.similarities BM25Similarity getDiscountOverlaps.

Prototype

public boolean getDiscountOverlaps() 

Source Link

Document

Returns true if overlap tokens are discounted from the document's length.

Usage

From source file:org.elasticsearch.index.similarity.SimilarityTests.java

License:Apache License

@Test
public void testResolveSimilaritiesFromMapping_bm25() throws IOException {
    String mapping = XContentFactory.jsonBuilder().startObject().startObject("type").startObject("properties")
            .startObject("field1").field("type", "string").field("similarity", "my_similarity").endObject()
            .endObject().endObject().endObject().string();

    Settings indexSettings = ImmutableSettings.settingsBuilder()
            .put("index.similarity.my_similarity.type", "BM25").put("index.similarity.my_similarity.k1", 2.0f)
            .put("index.similarity.my_similarity.b", 1.5f)
            .put("index.similarity.my_similarity.discount_overlaps", false).build();
    SimilarityService similarityService = similarityService(indexSettings);
    DocumentMapper documentMapper = similarityService.mapperService().documentMapperParser().parse(mapping);
    assertThat(documentMapper.mappers().name("field1").mapper().similarity(),
            instanceOf(BM25SimilarityProvider.class));

    BM25Similarity similarity = (BM25Similarity) documentMapper.mappers().name("field1").mapper().similarity()
            .get();/* ww  w . j av  a 2 s  .c  o m*/
    assertThat(similarity.getK1(), equalTo(2.0f));
    assertThat(similarity.getB(), equalTo(1.5f));
    assertThat(similarity.getDiscountOverlaps(), equalTo(false));
}

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