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FlatObjectFieldMapper.java
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FlatObjectFieldMapper.java
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/*
* SPDX-License-Identifier: Apache-2.0
*
* The OpenSearch Contributors require contributions made to
* this file be licensed under the Apache-2.0 license or a
* compatible open source license.
*/
package org.opensearch.index.mapper;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.FieldType;
import org.apache.lucene.document.SortedSetDocValuesField;
import org.apache.lucene.index.IndexOptions;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.BoostQuery;
import org.apache.lucene.search.MultiTermQuery;
import org.apache.lucene.search.PrefixQuery;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.TermInSetQuery;
import org.apache.lucene.search.TermQuery;
import org.apache.lucene.search.TermRangeQuery;
import org.apache.lucene.util.BytesRef;
import org.opensearch.OpenSearchException;
import org.opensearch.Version;
import org.opensearch.common.Nullable;
import org.opensearch.common.collect.Iterators;
import org.opensearch.common.lucene.Lucene;
import org.opensearch.common.lucene.search.AutomatonQueries;
import org.opensearch.core.xcontent.DeprecationHandler;
import org.opensearch.core.xcontent.NamedXContentRegistry;
import org.opensearch.core.xcontent.XContentParser;
import org.opensearch.common.xcontent.JsonToStringXContentParser;
import org.opensearch.index.analysis.IndexAnalyzers;
import org.opensearch.index.analysis.NamedAnalyzer;
import org.opensearch.index.fielddata.IndexFieldData;
import org.opensearch.index.fielddata.plain.SortedSetOrdinalsIndexFieldData;
import org.opensearch.index.query.QueryShardContext;
import org.opensearch.index.query.QueryShardException;
import org.opensearch.search.aggregations.support.CoreValuesSourceType;
import org.opensearch.search.lookup.SearchLookup;
import java.io.IOException;
import java.io.UncheckedIOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.function.BiFunction;
import java.util.function.Supplier;
import static org.opensearch.search.SearchService.ALLOW_EXPENSIVE_QUERIES;
/**
* A field mapper for flat_objects.
* This mapper accepts JSON object and treat as string fields in one index.
* @opensearch.internal
*/
public final class FlatObjectFieldMapper extends DynamicKeyFieldMapper {
public static final String CONTENT_TYPE = "flat_object";
private static final String VALUE_AND_PATH_SUFFIX = "._valueAndPath";
private static final String VALUE_SUFFIX = "._value";
private static final String DOT_SYMBOL = ".";
private static final String EQUAL_SYMBOL = "=";
/**
* In flat_object field mapper, field type is similar to keyword field type
* Cannot be tokenized, can OmitNorms, and can setIndexOption.
* @opensearch.internal
*/
public static class Defaults {
public static final FieldType FIELD_TYPE = new FieldType();
static {
FIELD_TYPE.setTokenized(false);
FIELD_TYPE.setOmitNorms(true);
FIELD_TYPE.setIndexOptions(IndexOptions.DOCS);
FIELD_TYPE.freeze();
}
}
@Override
public MappedFieldType keyedFieldType(String key) {
return new FlatObjectFieldType(this.name() + DOT_SYMBOL + key);
}
/**
* FlatObjectFieldType is the parent field type.
*/
public static class FlatObjectField extends Field {
public FlatObjectField(String field, BytesRef term, FieldType ft) {
super(field, term, ft);
}
}
private static FlatObjectFieldMapper toType(FieldMapper in) {
return (FlatObjectFieldMapper) in;
}
/**
* The builder for the flat_object field mapper using default parameters
* @opensearch.internal
*/
public static class Builder extends FieldMapper.Builder<Builder> {
private final IndexAnalyzers indexAnalyzers;
Builder(String name, IndexAnalyzers indexAnalyzers) {
super(name, Defaults.FIELD_TYPE);
builder = this;
this.indexAnalyzers = indexAnalyzers;
}
public Builder(String name) {
this(name, null);
}
private FlatObjectFieldType buildFlatObjectFieldType(BuilderContext context, FieldType fieldType) {
return new FlatObjectFieldType(buildFullName(context), fieldType);
}
/**
* ValueFieldMapper is the subfield type for values in the Json.
* use a {@link KeywordFieldMapper.KeywordField}
*/
private ValueFieldMapper buildValueFieldMapper(BuilderContext context, FieldType fieldType, FlatObjectFieldType fft) {
String fullName = buildFullName(context);
FieldType vft = new FieldType(fieldType);
KeywordFieldMapper.KeywordFieldType valueFieldType = new KeywordFieldMapper.KeywordFieldType(fullName + VALUE_SUFFIX, vft);
fft.setValueFieldType(valueFieldType);
return new ValueFieldMapper(vft, valueFieldType);
}
/**
* ValueAndPathFieldMapper is the subfield type for path=value format in the Json.
* also use a {@link KeywordFieldMapper.KeywordField}
*/
private ValueAndPathFieldMapper buildValueAndPathFieldMapper(BuilderContext context, FieldType fieldType, FlatObjectFieldType fft) {
String fullName = buildFullName(context);
FieldType vft = new FieldType(fieldType);
KeywordFieldMapper.KeywordFieldType ValueAndPathFieldType = new KeywordFieldMapper.KeywordFieldType(
fullName + VALUE_AND_PATH_SUFFIX,
vft
);
fft.setValueAndPathFieldType(ValueAndPathFieldType);
return new ValueAndPathFieldMapper(vft, ValueAndPathFieldType);
}
@Override
public FlatObjectFieldMapper build(BuilderContext context) {
FieldType fieldtype = new FieldType(Defaults.FIELD_TYPE);
FlatObjectFieldType fft = buildFlatObjectFieldType(context, fieldtype);
return new FlatObjectFieldMapper(
name,
Defaults.FIELD_TYPE,
fft,
buildValueFieldMapper(context, fieldtype, fft),
buildValueAndPathFieldMapper(context, fieldtype, fft),
CopyTo.empty(),
this
);
}
}
public static final TypeParser PARSER = new TypeParser((n, c) -> new Builder(n, c.getIndexAnalyzers()));
/**
* Creates a new TypeParser for flatObjectFieldMapper that does not use ParameterizedFieldMapper
*/
public static class TypeParser implements Mapper.TypeParser {
private final BiFunction<String, ParserContext, Builder> builderFunction;
public TypeParser(BiFunction<String, ParserContext, Builder> builderFunction) {
this.builderFunction = builderFunction;
}
@Override
public Mapper.Builder<?> parse(String name, Map<String, Object> node, ParserContext parserContext) throws MapperParsingException {
Builder builder = builderFunction.apply(name, parserContext);
return builder;
}
}
/**
* flat_object fields type contains its own fieldType, one valueFieldType and one valueAndPathFieldType
* @opensearch.internal
*/
public static final class FlatObjectFieldType extends StringFieldType {
private final int ignoreAbove;
private final String nullValue;
private KeywordFieldMapper.KeywordFieldType valueFieldType;
private KeywordFieldMapper.KeywordFieldType valueAndPathFieldType;
public FlatObjectFieldType(String name, boolean isSearchable, boolean hasDocValues, Map<String, String> meta) {
super(name, isSearchable, false, true, TextSearchInfo.SIMPLE_MATCH_ONLY, meta);
setIndexAnalyzer(Lucene.KEYWORD_ANALYZER);
this.ignoreAbove = Integer.MAX_VALUE;
this.nullValue = null;
}
public FlatObjectFieldType(String name) {
this(name, true, true, Collections.emptyMap());
}
public FlatObjectFieldType(String name, FieldType fieldType) {
super(
name,
fieldType.indexOptions() != IndexOptions.NONE,
false,
true,
new TextSearchInfo(fieldType, null, Lucene.KEYWORD_ANALYZER, Lucene.KEYWORD_ANALYZER),
Collections.emptyMap()
);
this.ignoreAbove = Integer.MAX_VALUE;
this.nullValue = null;
}
public FlatObjectFieldType(String name, NamedAnalyzer analyzer) {
super(name, true, false, true, new TextSearchInfo(Defaults.FIELD_TYPE, null, analyzer, analyzer), Collections.emptyMap());
this.ignoreAbove = Integer.MAX_VALUE;
this.nullValue = null;
}
void setValueFieldType(KeywordFieldMapper.KeywordFieldType valueFieldType) {
this.valueFieldType = valueFieldType;
}
void setValueAndPathFieldType(KeywordFieldMapper.KeywordFieldType ValueAndPathFieldType) {
this.valueAndPathFieldType = ValueAndPathFieldType;
}
public KeywordFieldMapper.KeywordFieldType getValueFieldType() {
return this.valueFieldType;
}
public KeywordFieldMapper.KeywordFieldType getValueAndPathFieldType() {
return this.valueAndPathFieldType;
}
@Override
public String typeName() {
return CONTENT_TYPE;
}
NamedAnalyzer normalizer() {
return indexAnalyzer();
}
/**
*
* Fielddata is an in-memory data structure that is used for aggregations, sorting, and scripting.
* @param fullyQualifiedIndexName the name of the index this field-data is build for
* @param searchLookup a {@link SearchLookup} supplier to allow for accessing other fields values in the context of runtime fields
* @return IndexFieldData.Builder
*/
@Override
public IndexFieldData.Builder fielddataBuilder(String fullyQualifiedIndexName, Supplier<SearchLookup> searchLookup) {
failIfNoDocValues();
return new SortedSetOrdinalsIndexFieldData.Builder(name(), CoreValuesSourceType.BYTES);
}
@Override
public ValueFetcher valueFetcher(QueryShardContext context, SearchLookup searchLookup, String format) {
if (format != null) {
throw new IllegalArgumentException("Field [" + name() + "] of type [" + typeName() + "] doesn't support formats.");
}
return new SourceValueFetcher(name(), context, nullValue) {
@Override
protected String parseSourceValue(Object value) {
String flatObjectKeywordValue = value.toString();
if (flatObjectKeywordValue.length() > ignoreAbove) {
return null;
}
NamedAnalyzer normalizer = normalizer();
if (normalizer == null) {
return flatObjectKeywordValue;
}
try {
return normalizeValue(normalizer, name(), flatObjectKeywordValue);
} catch (IOException e) {
throw new UncheckedIOException(e);
}
}
};
}
@Override
public Object valueForDisplay(Object value) {
if (value == null) {
return null;
}
// flat_objects are internally stored as utf8 bytes
BytesRef binaryValue = (BytesRef) value;
return binaryValue.utf8ToString();
}
@Override
protected BytesRef indexedValueForSearch(Object value) {
if (getTextSearchInfo().getSearchAnalyzer() == Lucene.KEYWORD_ANALYZER) {
// flat_object analyzer with the default attribute source which encodes terms using UTF8
// in that case we skip normalization, which may be slow if there many terms need to
// parse (eg. large terms query) since Analyzer.normalize involves things like creating
// attributes through reflection
// This if statement will be used whenever a normalizer is NOT configured
return super.indexedValueForSearch(value);
}
if (value == null) {
return null;
}
value = inputToString(value);
return getTextSearchInfo().getSearchAnalyzer().normalize(name(), value.toString());
}
/**
* redirect queries with rewrite value to rewriteSearchValue and directSubFieldName
*/
@Override
public Query termQuery(Object value, @Nullable QueryShardContext context) {
String searchValueString = inputToString(value);
String directSubFieldName = directSubfield();
String rewriteSearchValue = rewriteValue(searchValueString);
failIfNotIndexed();
Query query;
query = new TermQuery(new Term(directSubFieldName, indexedValueForSearch(rewriteSearchValue)));
if (boost() != 1f) {
query = new BoostQuery(query, boost());
}
return query;
}
@Override
public Query termsQuery(List<?> values, QueryShardContext context) {
failIfNotIndexed();
String directedSearchFieldName = directSubfield();
BytesRef[] bytesRefs = new BytesRef[values.size()];
for (int i = 0; i < bytesRefs.length; i++) {
String rewriteValues = rewriteValue(inputToString(values.get(i)));
bytesRefs[i] = indexedValueForSearch(new BytesRef(rewriteValues));
}
return new TermInSetQuery(directedSearchFieldName, bytesRefs);
}
/**
* To direct search fields, if a dot path was used in search query,
* then direct to flatObjectFieldName._valueAndPath subfield,
* else, direct to flatObjectFieldName._value subfield.
* @return directedSubFieldName
*/
public String directSubfield() {
if (name().contains(DOT_SYMBOL)) {
String[] dotPathList = name().split("\\.");
return dotPathList[0] + VALUE_AND_PATH_SUFFIX;
} else {
return this.valueFieldType.name();
}
}
/**
* If the search key is assigned with value,
* the dot path was used in search query, then
* rewrite the searchValueString as the format "dotpath=value",
* @return rewriteSearchValue
*/
public String rewriteValue(String searchValueString) {
if (!name().contains(DOT_SYMBOL)) {
return searchValueString;
} else {
String rewriteSearchValue = new StringBuilder().append(name()).append(EQUAL_SYMBOL).append(searchValueString).toString();
return rewriteSearchValue;
}
}
private String inputToString(Object inputValue) {
if (inputValue instanceof Integer) {
String inputToString = Integer.toString((Integer) inputValue);
return inputToString;
} else if (inputValue instanceof Float) {
String inputToString = Float.toString((Float) inputValue);
return inputToString;
} else if (inputValue instanceof Boolean) {
String inputToString = Boolean.toString((Boolean) inputValue);
return inputToString;
} else if (inputValue instanceof Short) {
String inputToString = Short.toString((Short) inputValue);
return inputToString;
} else if (inputValue instanceof Long) {
String inputToString = Long.toString((Long) inputValue);
return inputToString;
} else if (inputValue instanceof Double) {
String inputToString = Double.toString((Double) inputValue);
return inputToString;
} else if (inputValue instanceof BytesRef) {
String inputToString = (((BytesRef) inputValue).utf8ToString());
return inputToString;
} else if (inputValue instanceof String) {
String inputToString = (String) inputValue;
return inputToString;
} else if (inputValue instanceof Version) {
String inputToString = inputValue.toString();
return inputToString;
} else {
// default to cast toString
return inputValue.toString();
}
}
@Override
public Query prefixQuery(String value, MultiTermQuery.RewriteMethod method, boolean caseInsensitive, QueryShardContext context) {
String directSubfield = directSubfield();
String rewriteValue = rewriteValue(value);
if (context.allowExpensiveQueries() == false) {
throw new OpenSearchException(
"[prefix] queries cannot be executed when '"
+ ALLOW_EXPENSIVE_QUERIES.getKey()
+ "' is set to false. For optimised prefix queries on text "
+ "fields please enable [index_prefixes]."
);
}
failIfNotIndexed();
if (method == null) {
method = MultiTermQuery.CONSTANT_SCORE_REWRITE;
}
if (caseInsensitive) {
return AutomatonQueries.caseInsensitivePrefixQuery((new Term(directSubfield, indexedValueForSearch(rewriteValue))), method);
}
return new PrefixQuery(new Term(directSubfield, indexedValueForSearch(rewriteValue)), method);
}
@Override
public Query rangeQuery(Object lowerTerm, Object upperTerm, boolean includeLower, boolean includeUpper, QueryShardContext context) {
String directSubfield = directSubfield();
String rewriteUpperTerm = rewriteValue(inputToString(upperTerm));
String rewriteLowerTerm = rewriteValue(inputToString(lowerTerm));
if (context.allowExpensiveQueries() == false) {
throw new OpenSearchException(
"[range] queries on [text] or [keyword] fields cannot be executed when '"
+ ALLOW_EXPENSIVE_QUERIES.getKey()
+ "' is set to false."
);
}
failIfNotIndexed();
return new TermRangeQuery(
directSubfield,
lowerTerm == null ? null : indexedValueForSearch(rewriteLowerTerm),
upperTerm == null ? null : indexedValueForSearch(rewriteUpperTerm),
includeLower,
includeUpper
);
}
/**
* if there is dot path. query the field name in flatObject parent field.
* else query in _field_names system field
*/
@Override
public Query existsQuery(QueryShardContext context) {
String searchKey;
String searchField;
if (name().contains(DOT_SYMBOL)) {
searchKey = name().split("\\.")[0];
searchField = name();
} else {
searchKey = FieldNamesFieldMapper.NAME;
searchField = name();
}
return new TermQuery(new Term(searchKey, indexedValueForSearch(searchField)));
}
@Override
public Query wildcardQuery(
String value,
@Nullable MultiTermQuery.RewriteMethod method,
boolean caseInsensitve,
QueryShardContext context
) {
// flat_object field types are always normalized, so ignore case sensitivity and force normalize the wildcard
// query text
throw new QueryShardException(
context,
"Can only use wildcard queries on keyword and text fields - not on [" + name() + "] which is of type [" + typeName() + "]"
);
}
}
private final ValueFieldMapper valueFieldMapper;
private final ValueAndPathFieldMapper valueAndPathFieldMapper;
private final IndexAnalyzers indexAnalyzers;
FlatObjectFieldMapper(
String simpleName,
FieldType fieldType,
FlatObjectFieldType mappedFieldType,
ValueFieldMapper valueFieldMapper,
ValueAndPathFieldMapper valueAndPathFieldMapper,
CopyTo copyTo,
Builder builder
) {
super(simpleName, fieldType, mappedFieldType, copyTo);
assert fieldType.indexOptions().compareTo(IndexOptions.DOCS_AND_FREQS) <= 0;
this.fieldType = fieldType;
this.indexAnalyzers = builder.indexAnalyzers;
this.valueFieldMapper = valueFieldMapper;
this.valueAndPathFieldMapper = valueAndPathFieldMapper;
this.mappedFieldType = mappedFieldType;
}
@Override
protected FlatObjectFieldMapper clone() {
return (FlatObjectFieldMapper) super.clone();
}
@Override
protected void mergeOptions(FieldMapper other, List<String> conflicts) {
}
@Override
public FlatObjectFieldType fieldType() {
return (FlatObjectFieldType) super.fieldType();
}
@Override
protected void parseCreateField(ParseContext context) throws IOException {
String fieldName = null;
if (context.externalValueSet()) {
String value = context.externalValue().toString();
parseValueAddFields(context, value, fieldType().name());
} else {
JsonToStringXContentParser JsonToStringParser = new JsonToStringXContentParser(
NamedXContentRegistry.EMPTY,
DeprecationHandler.IGNORE_DEPRECATIONS,
context,
fieldType().name()
);
/**
* JsonToStringParser is the main parser class to transform JSON into stringFields in a XContentParser
* It reads the JSON object and parsed to a list of string
*/
XContentParser parser = JsonToStringParser.parseObject();
XContentParser.Token currentToken;
while ((currentToken = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
switch (currentToken) {
case FIELD_NAME:
fieldName = parser.currentName();
break;
case VALUE_STRING:
String value = parser.textOrNull();
parseValueAddFields(context, value, fieldName);
break;
}
}
}
}
@Override
public Iterator<Mapper> iterator() {
List<Mapper> subIterators = new ArrayList<>();
if (valueFieldMapper != null) {
subIterators.add(valueFieldMapper);
}
if (valueAndPathFieldMapper != null) {
subIterators.add(valueAndPathFieldMapper);
}
if (subIterators.size() == 0) {
return super.iterator();
}
@SuppressWarnings("unchecked")
Iterator<Mapper> concat = Iterators.concat(super.iterator(), subIterators.iterator());
return concat;
}
/**
* parseValueAddFields method will store data to Lucene.
* the JsonToStringXContentParser returns XContentParser with 3 string fields
* fieldName, fieldName._value, fieldName._valueAndPath.
* parseValueAddFields recognized string by the stringfield name,
* fieldName will be store through the parent FlatObjectFieldMapper,which contains all the keys
* fieldName._value will be store through the valueFieldMapper, which contains the values of the Json Object
* fieldName._valueAndPath will be store through the valueAndPathFieldMapper, which contains the "path=values" format
*/
private void parseValueAddFields(ParseContext context, String value, String fieldName) throws IOException {
NamedAnalyzer normalizer = fieldType().normalizer();
if (normalizer != null) {
value = normalizeValue(normalizer, name(), value);
}
String[] valueTypeList = fieldName.split("\\._");
String valueType = "._" + valueTypeList[valueTypeList.length - 1];
if (fieldType.indexOptions() != IndexOptions.NONE || fieldType.stored()) {
// convert to utf8 only once before feeding postings/dv/stored fields
final BytesRef binaryValue = new BytesRef(fieldType().name() + DOT_SYMBOL + value);
Field field = new FlatObjectField(fieldType().name(), binaryValue, fieldType);
if (fieldType().hasDocValues() == false && fieldType.omitNorms()) {
createFieldNamesField(context);
}
if (fieldName.equals(fieldType().name())) {
context.doc().add(field);
}
if (valueType.equals(VALUE_SUFFIX)) {
if (valueFieldMapper != null) {
valueFieldMapper.addField(context, value);
}
}
if (valueType.equals(VALUE_AND_PATH_SUFFIX)) {
if (valueAndPathFieldMapper != null) {
valueAndPathFieldMapper.addField(context, value);
}
}
if (fieldType().hasDocValues()) {
if (context.doc().getField(fieldType().name()) == null || !context.doc().getFields(fieldType().name()).equals(field)) {
if (fieldName.equals(fieldType().name())) {
context.doc().add(new SortedSetDocValuesField(fieldType().name(), binaryValue));
}
if (valueType.equals(VALUE_SUFFIX)) {
if (valueFieldMapper != null) {
context.doc().add(new SortedSetDocValuesField(fieldType().name() + VALUE_SUFFIX, binaryValue));
}
}
if (valueType.equals(VALUE_AND_PATH_SUFFIX)) {
if (valueAndPathFieldMapper != null) {
context.doc().add(new SortedSetDocValuesField(fieldType().name() + VALUE_AND_PATH_SUFFIX, binaryValue));
}
}
}
}
}
}
private static String normalizeValue(NamedAnalyzer normalizer, String field, String value) throws IOException {
String normalizerErrorMessage = "The normalization token stream is "
+ "expected to produce exactly 1 token, but got 0 for analyzer "
+ normalizer
+ " and input \""
+ value
+ "\"";
try (TokenStream ts = normalizer.tokenStream(field, value)) {
final CharTermAttribute termAtt = ts.addAttribute(CharTermAttribute.class);
ts.reset();
if (ts.incrementToken() == false) {
throw new IllegalStateException(normalizerErrorMessage);
}
final String newValue = termAtt.toString();
if (ts.incrementToken()) {
throw new IllegalStateException(normalizerErrorMessage);
}
ts.end();
return newValue;
}
}
@Override
protected String contentType() {
return CONTENT_TYPE;
}
private static final class ValueAndPathFieldMapper extends FieldMapper {
protected ValueAndPathFieldMapper(FieldType fieldType, KeywordFieldMapper.KeywordFieldType mappedFieldType) {
super(mappedFieldType.name(), fieldType, mappedFieldType, MultiFields.empty(), CopyTo.empty());
}
void addField(ParseContext context, String value) {
final BytesRef binaryValue = new BytesRef(value);
if (fieldType.indexOptions() != IndexOptions.NONE || fieldType.stored()) {
Field field = new KeywordFieldMapper.KeywordField(fieldType().name(), binaryValue, fieldType);
context.doc().add(field);
if (fieldType().hasDocValues() == false && fieldType.omitNorms()) {
createFieldNamesField(context);
}
}
}
@Override
protected void parseCreateField(ParseContext context) {
throw new UnsupportedOperationException();
}
@Override
protected void mergeOptions(FieldMapper other, List<String> conflicts) {
}
@Override
protected String contentType() {
return "valueAndPath";
}
@Override
public String toString() {
return fieldType().toString();
}
}
private static final class ValueFieldMapper extends FieldMapper {
protected ValueFieldMapper(FieldType fieldType, KeywordFieldMapper.KeywordFieldType mappedFieldType) {
super(mappedFieldType.name(), fieldType, mappedFieldType, MultiFields.empty(), CopyTo.empty());
}
void addField(ParseContext context, String value) {
final BytesRef binaryValue = new BytesRef(value);
if (fieldType.indexOptions() != IndexOptions.NONE || fieldType.stored()) {
Field field = new KeywordFieldMapper.KeywordField(fieldType().name(), binaryValue, fieldType);
context.doc().add(field);
if (fieldType().hasDocValues() == false && fieldType.omitNorms()) {
createFieldNamesField(context);
}
}
}
@Override
protected void parseCreateField(ParseContext context) {
throw new UnsupportedOperationException();
}
@Override
protected void mergeOptions(FieldMapper other, List<String> conflicts) {
}
@Override
protected String contentType() {
return "value";
}
@Override
public String toString() {
return fieldType().toString();
}
}
}