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/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch licenses this file to you under
 * the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.elasticsearch.index.similarity;

import org.apache.lucene.search.similarities.BM25Similarity;
import org.apache.lucene.search.similarities.Similarity;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.inject.assistedinject.Assisted;
import org.elasticsearch.common.settings.Settings;

/**
 * {@link SimilarityProvider} for the {@link BM25Similarity}.
 * 

* Configuration options available: *

    *
  • k1
  • *
  • b
  • *
  • discount_overlaps
  • *
* @see BM25Similarity For more information about configuration */ public class BM25SimilarityProvider extends AbstractSimilarityProvider { private final BM25Similarity similarity; @Inject public BM25SimilarityProvider(@Assisted String name, @Assisted Settings settings) { super(name); float k1 = settings.getAsFloat("k1", 1.2f); float b = settings.getAsFloat("b", 0.75f); boolean discountOverlaps = settings.getAsBoolean("discount_overlaps", true); this.similarity = new BM25Similarity(k1, b); this.similarity.setDiscountOverlaps(discountOverlaps); } /** * {@inheritDoc} */ @Override public Similarity get() { return similarity; } }




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