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Provide access to _type in 5.x indices (#83195)
Allows running queries against _type on 5.x indices as well as returning _type in search results. Relates #81210
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98 changes: 98 additions & 0 deletions
98
server/src/main/java/org/elasticsearch/index/mapper/LegacyTypeFieldMapper.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,98 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
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| package org.elasticsearch.index.mapper; | ||
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| import org.apache.lucene.document.SortedSetDocValuesField; | ||
| import org.apache.lucene.sandbox.search.DocValuesTermsQuery; | ||
| import org.apache.lucene.search.Query; | ||
| import org.apache.lucene.util.BytesRef; | ||
| import org.elasticsearch.common.lucene.Lucene; | ||
| import org.elasticsearch.index.query.SearchExecutionContext; | ||
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| import java.util.Collection; | ||
| import java.util.Collections; | ||
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| /** | ||
| * Field mapper to access the legacy _type that existed in Elasticsearch 5 | ||
| */ | ||
| public class LegacyTypeFieldMapper extends MetadataFieldMapper { | ||
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| public static final String NAME = "_type"; | ||
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| public static final String CONTENT_TYPE = "_type"; | ||
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| private static final LegacyTypeFieldMapper INSTANCE = new LegacyTypeFieldMapper(); | ||
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| public static final TypeParser PARSER = new FixedTypeParser(c -> INSTANCE); | ||
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| protected LegacyTypeFieldMapper() { | ||
| super(new LegacyTypeFieldType(), Lucene.KEYWORD_ANALYZER); | ||
| } | ||
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| static final class LegacyTypeFieldType extends TermBasedFieldType { | ||
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| LegacyTypeFieldType() { | ||
| super(NAME, false, true, true, TextSearchInfo.SIMPLE_MATCH_ONLY, Collections.emptyMap()); | ||
| } | ||
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| @Override | ||
| public String typeName() { | ||
| return CONTENT_TYPE; | ||
| } | ||
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| @Override | ||
| public boolean isSearchable() { | ||
| // The _type field is always searchable. | ||
| return true; | ||
| } | ||
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| @Override | ||
| public Query termQuery(Object value, SearchExecutionContext context) { | ||
| return SortedSetDocValuesField.newSlowExactQuery(name(), indexedValueForSearch(value)); | ||
| } | ||
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| @Override | ||
| public Query termsQuery(Collection<?> values, SearchExecutionContext context) { | ||
| BytesRef[] bytesRefs = values.stream().map(this::indexedValueForSearch).toArray(BytesRef[]::new); | ||
| return new DocValuesTermsQuery(name(), bytesRefs); | ||
| } | ||
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| @Override | ||
| public Query rangeQuery( | ||
| Object lowerTerm, | ||
| Object upperTerm, | ||
| boolean includeLower, | ||
| boolean includeUpper, | ||
| SearchExecutionContext context | ||
| ) { | ||
| return SortedSetDocValuesField.newSlowRangeQuery( | ||
| name(), | ||
| lowerTerm == null ? null : indexedValueForSearch(lowerTerm), | ||
| upperTerm == null ? null : indexedValueForSearch(upperTerm), | ||
| includeLower, | ||
| includeUpper | ||
| ); | ||
| } | ||
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| @Override | ||
| public boolean mayExistInIndex(SearchExecutionContext context) { | ||
| return true; | ||
| } | ||
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| @Override | ||
| public ValueFetcher valueFetcher(SearchExecutionContext context, String format) { | ||
| return new StoredValueFetcher(context.lookup(), NAME); | ||
| } | ||
| } | ||
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| @Override | ||
| protected String contentType() { | ||
| return CONTENT_TYPE; | ||
| } | ||
| } |
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