org.elasticsearch.search.fetch.subphase.ExplainPhase Maven / Gradle / Ivy
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/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0 and the Server Side Public License, v 1; you may not use this file except
* in compliance with, at your election, the Elastic License 2.0 or the Server
* Side Public License, v 1.
*/
package org.elasticsearch.search.fetch.subphase;
import org.apache.lucene.index.LeafReaderContext;
import org.apache.lucene.search.Explanation;
import org.elasticsearch.search.fetch.FetchContext;
import org.elasticsearch.search.fetch.FetchSubPhase;
import org.elasticsearch.search.fetch.FetchSubPhaseProcessor;
import org.elasticsearch.search.rescore.RescoreContext;
import java.io.IOException;
/**
* Explains the scoring calculations for the top hits.
*/
public final class ExplainPhase implements FetchSubPhase {
@Override
public FetchSubPhaseProcessor getProcessor(FetchContext context) {
if (context.explain() == false) {
return null;
}
return new FetchSubPhaseProcessor() {
@Override
public void setNextReader(LeafReaderContext readerContext) {
}
@Override
public void process(HitContext hitContext) throws IOException {
final int topLevelDocId = hitContext.hit().docId();
Explanation explanation = context.searcher().explain(context.rewrittenQuery(), topLevelDocId);
for (RescoreContext rescore : context.rescore()) {
explanation = rescore.rescorer().explain(topLevelDocId, context.searcher(), rescore, explanation);
}
// we use the top level doc id, since we work with the top level searcher
hitContext.hit().explanation(explanation);
}
};
}
}