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There is a newer version: 6.4.2_1

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF 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.apache.lucene.search;

import org.apache.lucene.index.Terms; // javadocs only
import org.apache.lucene.index.TermsEnum; // javadocs only
import org.apache.lucene.util.Attribute;
import org.apache.lucene.util.AttributeSource; // javadocs only

/**
 * Add this {@link Attribute} to a {@link TermsEnum} returned by {@link
 * MultiTermQuery#getTermsEnum(Terms,AttributeSource)} and update the boost on each returned term.
 * This enables to control the boost factor for each matching term in {@link
 * MultiTermQuery#SCORING_BOOLEAN_REWRITE} or {@link TopTermsRewrite} mode. {@link FuzzyQuery} is
 * using this to take the edit distance into account.
 *
 * Please note: This attribute is intended to be added only by the TermsEnum to itself in
 * its constructor and consumed by the {@link MultiTermQuery.RewriteMethod}.
 *
 * @lucene.internal
 */
public interface BoostAttribute extends Attribute {
  float DEFAULT_BOOST = 1.0f;

  /** Sets the boost in this attribute */
  public void setBoost(float boost);

  /** Retrieves the boost, default is {@code 1.0f}. */
  public float getBoost();
}