Close over lookup

nik9000 · Sep 8, 2020 · 4e5bd65 · 4e5bd65
1 parent 6a6584b
commit 4e5bd65
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Showing 36 changed files with 74 additions and 77 deletions.
diff --git a/...es/mapper-extras/src/main/java/org/elasticsearch/index/mapper/RankFeatureFieldMapper.java b/...es/mapper-extras/src/main/java/org/elasticsearch/index/mapper/RankFeatureFieldMapper.java
@@ -187,7 +187,7 @@ public ValueFetcher valueFetcher(MapperService mapperService, SearchLookup searc
         if (format != null) {
             throw new IllegalArgumentException("Field [" + name() + "] of type [" + typeName() + "] doesn't support formats.");
         }
-        return new SourceValueFetcher(name(), mapperService, parsesArrayValue()) {
+        return new SourceValueFetcher(name(), mapperService, searchLookup.source(), parsesArrayValue()) {
             @Override
             protected Float parseSourceValue(Object value) {
                 return objectToFloat(value);

diff --git a/...s/mapper-extras/src/main/java/org/elasticsearch/index/mapper/RankFeaturesFieldMapper.java b/...s/mapper-extras/src/main/java/org/elasticsearch/index/mapper/RankFeaturesFieldMapper.java
@@ -166,7 +166,7 @@ public ValueFetcher valueFetcher(MapperService mapperService, SearchLookup searc
         if (format != null) {
             throw new IllegalArgumentException("Field [" + name() + "] of type [" + typeName() + "] doesn't support formats.");
         }
-        return new SourceValueFetcher(name(), mapperService, parsesArrayValue()) {
+        return new SourceValueFetcher(name(), mapperService, searchLookup.source(), parsesArrayValue()) {
             @Override
             protected Object parseSourceValue(Object value) {
                 return value;

diff --git a/...es/mapper-extras/src/main/java/org/elasticsearch/index/mapper/ScaledFloatFieldMapper.java b/...es/mapper-extras/src/main/java/org/elasticsearch/index/mapper/ScaledFloatFieldMapper.java
@@ -401,7 +401,7 @@ public ValueFetcher valueFetcher(MapperService mapperService, SearchLookup searc
         if (format != null) {
             throw new IllegalArgumentException("Field [" + name() + "] of type [" + typeName() + "] doesn't support formats.");
         }
-        return new SourceValueFetcher(name(), mapperService, parsesArrayValue()) {
+        return new SourceValueFetcher(name(), mapperService, searchLookup.source(), parsesArrayValue()) {
             @Override
             protected Double parseSourceValue(Object value) {
                 double doubleValue;

diff --git a/...les/mapper-extras/src/main/java/org/elasticsearch/index/mapper/TokenCountFieldMapper.java b/...les/mapper-extras/src/main/java/org/elasticsearch/index/mapper/TokenCountFieldMapper.java
@@ -165,7 +165,7 @@ public ValueFetcher valueFetcher(MapperService mapperService, SearchLookup searc
             throw new IllegalArgumentException("Field [" + name() + "] of type [" + typeName() + "] doesn't support formats.");
         }
 
-        return new SourceValueFetcher(name(), mapperService, parsesArrayValue(), nullValue) {
+        return new SourceValueFetcher(name(), mapperService, searchLookup.source(), parsesArrayValue(), nullValue) {
             @Override
             protected String parseSourceValue(Object value) {
                 return value.toString();

diff --git a/modules/parent-join/src/main/java/org/elasticsearch/join/mapper/ParentJoinFieldMapper.java b/modules/parent-join/src/main/java/org/elasticsearch/join/mapper/ParentJoinFieldMapper.java
@@ -356,7 +356,7 @@ public ValueFetcher valueFetcher(MapperService mapperService, SearchLookup searc
         if (format != null) {
             throw new IllegalArgumentException("Field [" + name() + "] of type [" + typeName() + "] doesn't support formats.");
         }
-        return new SourceValueFetcher(name(), mapperService, parsesArrayValue()) {
+        return new SourceValueFetcher(name(), mapperService, searchLookup.source(), parsesArrayValue()) {
             @Override
             protected Object parseSourceValue(Object value) {
                 return value;

diff --git a/modules/percolator/src/main/java/org/elasticsearch/percolator/PercolatorFieldMapper.java b/modules/percolator/src/main/java/org/elasticsearch/percolator/PercolatorFieldMapper.java
@@ -371,7 +371,7 @@ public ValueFetcher valueFetcher(MapperService mapperService, SearchLookup searc
         if (format != null) {
             throw new IllegalArgumentException("Field [" + name() + "] of type [" + typeName() + "] doesn't support formats.");
         }
-        return new SourceValueFetcher(name(), mapperService, parsesArrayValue()) {
+        return new SourceValueFetcher(name(), mapperService, searchLookup.source(), parsesArrayValue()) {
             @Override
             protected Object parseSourceValue(Object value) {
                 return value;

diff --git a/...ysis-icu/src/main/java/org/elasticsearch/index/mapper/ICUCollationKeywordFieldMapper.java b/...ysis-icu/src/main/java/org/elasticsearch/index/mapper/ICUCollationKeywordFieldMapper.java
@@ -740,7 +740,7 @@ public ValueFetcher valueFetcher(MapperService mapperService, SearchLookup searc
             throw new IllegalArgumentException("Field [" + name() + "] of type [" + typeName() + "] doesn't support formats.");
         }
 
-        return new SourceValueFetcher(name(), mapperService, parsesArrayValue(), nullValue) {
+        return new SourceValueFetcher(name(), mapperService, searchLookup.source(), parsesArrayValue(), nullValue) {
             @Override
             protected String parseSourceValue(Object value) {
                 String keywordValue = value.toString();

diff --git a/.../src/main/java/org/elasticsearch/index/mapper/annotatedtext/AnnotatedTextFieldMapper.java b/.../src/main/java/org/elasticsearch/index/mapper/annotatedtext/AnnotatedTextFieldMapper.java
@@ -594,7 +594,7 @@ public ValueFetcher valueFetcher(MapperService mapperService, SearchLookup searc
         if (format != null) {
             throw new IllegalArgumentException("Field [" + name() + "] of type [" + typeName() + "] doesn't support formats.");
         }
-        return new SourceValueFetcher(name(), mapperService, parsesArrayValue()) {
+        return new SourceValueFetcher(name(), mapperService, searchLookup.source(), parsesArrayValue()) {
             @Override
             protected Object parseSourceValue(Object value) {
                 return value.toString();

diff --git a/...pper-murmur3/src/main/java/org/elasticsearch/index/mapper/murmur3/Murmur3FieldMapper.java b/...pper-murmur3/src/main/java/org/elasticsearch/index/mapper/murmur3/Murmur3FieldMapper.java
@@ -157,7 +157,7 @@ public ValueFetcher valueFetcher(MapperService mapperService, SearchLookup searc
         if (format != null) {
             throw new IllegalArgumentException("Field [" + name() + "] of type [" + typeName() + "] doesn't support formats.");
         }
-        return new SourceValueFetcher(name(), mapperService, parsesArrayValue()) {
+        return new SourceValueFetcher(name(), mapperService, searchLookup.source(), parsesArrayValue()) {
             @Override
             protected String parseSourceValue(Object value) {
                 return value.toString();

diff --git a/server/src/main/java/org/elasticsearch/index/mapper/AbstractGeometryFieldMapper.java b/server/src/main/java/org/elasticsearch/index/mapper/AbstractGeometryFieldMapper.java
@@ -192,7 +192,7 @@ public ValueFetcher valueFetcher(MapperService mapperService, SearchLookup searc
         Parser<Parsed> geometryParser = mappedFieldType.geometryParser();
         Function<Object, Object> valueParser = value -> geometryParser.parseAndFormatObject(value, this, geoFormat);
 
-        return new SourceValueFetcher(name(), mapperService, parsesArrayValue()) {
+        return new SourceValueFetcher(name(), mapperService, searchLookup.source(), parsesArrayValue()) {
             @Override
             protected Object parseSourceValue(Object value) {
                 return valueParser.apply(value);

diff --git a/server/src/main/java/org/elasticsearch/index/mapper/BinaryFieldMapper.java b/server/src/main/java/org/elasticsearch/index/mapper/BinaryFieldMapper.java
@@ -196,7 +196,7 @@ public ValueFetcher valueFetcher(MapperService mapperService, SearchLookup searc
         if (format != null) {
             throw new IllegalArgumentException("Field [" + name() + "] of type [" + typeName() + "] doesn't support formats.");
         }
-        return new SourceValueFetcher(name(), mapperService, parsesArrayValue()) {
+        return new SourceValueFetcher(name(), mapperService, searchLookup.source(), parsesArrayValue()) {
             @Override
             protected Object parseSourceValue(Object value) {
                 return value;

diff --git a/server/src/main/java/org/elasticsearch/index/mapper/BooleanFieldMapper.java b/server/src/main/java/org/elasticsearch/index/mapper/BooleanFieldMapper.java
@@ -258,7 +258,7 @@ public ValueFetcher valueFetcher(MapperService mapperService, SearchLookup searc
             throw new IllegalArgumentException("Field [" + name() + "] of type [" + typeName() + "] doesn't support formats.");
         }
 
-        return new SourceValueFetcher(name(), mapperService, parsesArrayValue(), nullValue) {
+        return new SourceValueFetcher(name(), mapperService, searchLookup.source(), parsesArrayValue(), nullValue) {
             @Override
             protected Boolean parseSourceValue(Object value) {
                 if (value instanceof Boolean) {

diff --git a/server/src/main/java/org/elasticsearch/index/mapper/CompletionFieldMapper.java b/server/src/main/java/org/elasticsearch/index/mapper/CompletionFieldMapper.java
@@ -546,7 +546,7 @@ public ValueFetcher valueFetcher(MapperService mapperService, SearchLookup searc
             throw new IllegalArgumentException("Field [" + name() + "] of type [" + typeName() + "] doesn't support formats.");
         }
 
-        return new SourceValueFetcher(name(), mapperService, parsesArrayValue()) {
+        return new SourceValueFetcher(name(), mapperService, searchLookup.source(), parsesArrayValue()) {
             @Override
             protected List<?> parseSourceValue(Object value) {
                 if (value instanceof List) {

diff --git a/server/src/main/java/org/elasticsearch/index/mapper/DateFieldMapper.java b/server/src/main/java/org/elasticsearch/index/mapper/DateFieldMapper.java
@@ -612,7 +612,7 @@ public ValueFetcher valueFetcher(MapperService mapperService, SearchLookup searc
             ? DateFormatter.forPattern(format).withLocale(defaultFormatter.locale())
             : defaultFormatter;
 
-        return new SourceValueFetcher(name(), mapperService, parsesArrayValue(), nullValueAsString) {
+        return new SourceValueFetcher(name(), mapperService, searchLookup.source(), parsesArrayValue(), nullValueAsString) {
             @Override
             public String parseSourceValue(Object value) {
                 String date = value.toString();

diff --git a/server/src/main/java/org/elasticsearch/index/mapper/DocValueFetcher.java b/server/src/main/java/org/elasticsearch/index/mapper/DocValueFetcher.java
@@ -22,7 +22,6 @@
 import org.apache.lucene.index.LeafReaderContext;
 import org.elasticsearch.index.fielddata.IndexFieldData;
 import org.elasticsearch.search.DocValueFormat;
-import org.elasticsearch.search.lookup.SourceLookup;
 
 import java.io.IOException;
 import java.util.ArrayList;
@@ -46,8 +45,8 @@ public void setNextReader(LeafReaderContext context) {
     }
 
     @Override
-    public List<Object> fetchValues(SourceLookup lookup) throws IOException {
-        if (false == leaf.advanceExact(lookup.docId())) {
+    public List<Object> fetchValues(int docId) throws IOException {
+        if (false == leaf.advanceExact(docId)) {
             return List.of();
         }
         List<Object> result = new ArrayList<Object>(leaf.docValueCount());

diff --git a/server/src/main/java/org/elasticsearch/index/mapper/IpFieldMapper.java b/server/src/main/java/org/elasticsearch/index/mapper/IpFieldMapper.java
@@ -408,7 +408,7 @@ public ValueFetcher valueFetcher(MapperService mapperService, SearchLookup searc
         if (format != null) {
             throw new IllegalArgumentException("Field [" + name() + "] of type [" + typeName() + "] doesn't support formats.");
         }
-        return new SourceValueFetcher(name(), mapperService, parsesArrayValue(), nullValue) {
+        return new SourceValueFetcher(name(), mapperService, searchLookup.source(), parsesArrayValue(), nullValue) {
             @Override
             protected Object parseSourceValue(Object value) {
                 InetAddress address;

diff --git a/server/src/main/java/org/elasticsearch/index/mapper/KeywordFieldMapper.java b/server/src/main/java/org/elasticsearch/index/mapper/KeywordFieldMapper.java
@@ -398,7 +398,7 @@ public ValueFetcher valueFetcher(MapperService mapperService, SearchLookup searc
             throw new IllegalArgumentException("Field [" + name() + "] of type [" + typeName() + "] doesn't support formats.");
         }
 
-        return new SourceValueFetcher(name(), mapperService, parsesArrayValue(), nullValue) {
+        return new SourceValueFetcher(name(), mapperService, searchLookup.source(), parsesArrayValue(), nullValue) {
             @Override
             protected String parseSourceValue(Object value) {
                 String keywordValue = value.toString();

diff --git a/server/src/main/java/org/elasticsearch/index/mapper/NumberFieldMapper.java b/server/src/main/java/org/elasticsearch/index/mapper/NumberFieldMapper.java
@@ -1094,7 +1094,7 @@ public ValueFetcher valueFetcher(MapperService mapperService, SearchLookup searc
             throw new IllegalArgumentException("Field [" + name() + "] of type [" + typeName() + "] doesn't support formats.");
         }
 
-        return new SourceValueFetcher(name(), mapperService, parsesArrayValue(), nullValue) {
+        return new SourceValueFetcher(name(), mapperService, searchLookup.source(), parsesArrayValue(), nullValue) {
             @Override
             protected Object parseSourceValue(Object value) {
                 if (value.equals("")) {

diff --git a/server/src/main/java/org/elasticsearch/index/mapper/RangeFieldMapper.java b/server/src/main/java/org/elasticsearch/index/mapper/RangeFieldMapper.java
@@ -366,7 +366,7 @@ public ValueFetcher valueFetcher(MapperService mapperService, SearchLookup searc
             ? DateFormatter.forPattern(format).withLocale(defaultFormatter.locale())
             : defaultFormatter;
 
-        return new SourceValueFetcher(name(), mapperService, parsesArrayValue()) {
+        return new SourceValueFetcher(name(), mapperService, searchLookup.source(), parsesArrayValue()) {
 
             @Override
             @SuppressWarnings("unchecked")

diff --git a/server/src/main/java/org/elasticsearch/index/mapper/SourceValueFetcher.java b/server/src/main/java/org/elasticsearch/index/mapper/SourceValueFetcher.java
@@ -35,26 +35,38 @@
  */
 public abstract class SourceValueFetcher implements ValueFetcher {
     private final Set<String> sourcePaths;
+    private final SourceLookup lookup;
     private final @Nullable Object nullValue;
     private final boolean parsesArrayValue;
 
-    public SourceValueFetcher(String fieldName, MapperService mapperService, boolean parsesArrayValue) {
-        this(fieldName, mapperService, parsesArrayValue, null);
+    public SourceValueFetcher(String fieldName, MapperService mapperService, SourceLookup lookup, boolean parsesArrayValue) {
+        this(fieldName, mapperService, lookup, parsesArrayValue, null);
     }
 
     /**
      * @param fieldName The name of the field.
      * @param parsesArrayValue Whether the fetcher handles array values during document parsing.
      * @param nullValue A optional substitute value if the _source value is 'null'.
      */
-    public SourceValueFetcher(String fieldName, MapperService mapperService, boolean parsesArrayValue, Object nullValue) {
+    public SourceValueFetcher(
+        String fieldName,
+        MapperService mapperService,
+        SourceLookup lookup,
+        boolean parsesArrayValue,
+        Object nullValue
+    ) {
         this.sourcePaths = mapperService.sourcePath(fieldName);
+        this.lookup = lookup;
         this.nullValue = nullValue;
         this.parsesArrayValue = parsesArrayValue;
     }
 
     @Override
-    public List<Object> fetchValues(SourceLookup lookup) {
+    public List<Object> fetchValues(int docId) {
+        /*
+         * Pulls the values from the source, parses them and then them
+         * using parseSourceValue.
+         */
         List<Object> values = new ArrayList<>();
         for (String path : sourcePaths) {
             Object sourceValue = lookup.extractValue(path, nullValue);

diff --git a/server/src/main/java/org/elasticsearch/index/mapper/TextFieldMapper.java b/server/src/main/java/org/elasticsearch/index/mapper/TextFieldMapper.java
@@ -841,7 +841,7 @@ public ValueFetcher valueFetcher(MapperService mapperService, SearchLookup searc
         if (format != null) {
             throw new IllegalArgumentException("Field [" + name() + "] of type [" + typeName() + "] doesn't support formats.");
         }
-        return new SourceValueFetcher(name(), mapperService, parsesArrayValue()) {
+        return new SourceValueFetcher(name(), mapperService, searchLookup.source(), parsesArrayValue()) {
             @Override
             protected Object parseSourceValue(Object value) {
                 return value.toString();

diff --git a/server/src/main/java/org/elasticsearch/index/mapper/ValueFetcher.java b/server/src/main/java/org/elasticsearch/index/mapper/ValueFetcher.java
@@ -21,7 +21,6 @@
 
 import org.apache.lucene.index.LeafReaderContext;
 import org.elasticsearch.search.fetch.subphase.FetchFieldsPhase;
-import org.elasticsearch.search.lookup.SourceLookup;
 
 import java.io.IOException;
 import java.util.List;
@@ -32,19 +31,16 @@
  */
 public interface ValueFetcher {
     /**
-     * Given access to a document's _source, return this field's values.
-     *
-     * In addition to pulling out the values, they will be parsed into a standard form.
-     * For example numeric field mappers make sure to parse the source value into a number
-     * of the right type.
-     *
+     * Fetch this field's values, converting them into a "standard form" and applying
+     * any formats configured when the {@linkplain ValueFetcher} was built.
+     * <p>
      * Note that for array values, the order in which values are returned is undefined and
      * should not be relied on.
      *
-     * @param lookup a lookup structure over the document's source.
+     * @param docId the document's id.
      * @return a list a standardized field values.
      */
-    List<Object> fetchValues(SourceLookup lookup) throws IOException;
+    List<Object> fetchValues(int docId) throws IOException;
 
     /**
      * Update the leaf reader used to fetch values.

diff --git a/server/src/main/java/org/elasticsearch/search/fetch/subphase/FetchDocValuesPhase.java b/server/src/main/java/org/elasticsearch/search/fetch/subphase/FetchDocValuesPhase.java
@@ -86,7 +86,7 @@ public void process(HitContext hit) throws IOException {
                         // docValues fields will still be document fields, and put under "fields" section of a hit.
                         hit.hit().setDocumentField(f.getKey(), hitField);
                     }
-                    hitField.getValues().addAll(f.getValue().fetchValues(hit.sourceLookup()));
+                    hitField.getValues().addAll(f.getValue().fetchValues(hit.docId()));
                 }
             }
         };

diff --git a/server/src/main/java/org/elasticsearch/search/fetch/subphase/FetchFieldsPhase.java b/server/src/main/java/org/elasticsearch/search/fetch/subphase/FetchFieldsPhase.java
@@ -27,7 +27,6 @@
 import org.elasticsearch.search.fetch.FetchSubPhaseProcessor;
 import org.elasticsearch.search.internal.SearchContext;
 import org.elasticsearch.search.lookup.SearchLookup;
-import org.elasticsearch.search.lookup.SourceLookup;
 
 import java.io.IOException;
 import java.util.HashSet;
@@ -60,10 +59,8 @@ public void setNextReader(LeafReaderContext readerContext) {
             @Override
             public void process(HitContext hitContext) throws IOException {
                 SearchHit hit = hitContext.hit();
-                SourceLookup sourceLookup = hitContext.sourceLookup();
-
                 Set<String> ignoredFields = getIgnoredFields(hit);
-                Map<String, DocumentField> documentFields = retriever.retrieve(sourceLookup, ignoredFields);
+                Map<String, DocumentField> documentFields = retriever.retrieve(hit.docId(), ignoredFields);
                 for (Map.Entry<String, DocumentField> entry : documentFields.entrySet()) {
                     hit.setDocumentField(entry.getKey(), entry.getValue());
                 }

diff --git a/server/src/main/java/org/elasticsearch/search/fetch/subphase/FieldValueRetriever.java b/server/src/main/java/org/elasticsearch/search/fetch/subphase/FieldValueRetriever.java
@@ -28,7 +28,6 @@
 import org.elasticsearch.index.mapper.MappingLookup;
 import org.elasticsearch.index.mapper.ValueFetcher;
 import org.elasticsearch.search.lookup.SearchLookup;
-import org.elasticsearch.search.lookup.SourceLookup;
 
 import java.io.IOException;
 import java.util.ArrayList;
@@ -83,7 +82,7 @@ private FieldValueRetriever(List<FieldContext> fieldContexts) {
         this.fieldContexts = fieldContexts;
     }
 
-    public Map<String, DocumentField> retrieve(SourceLookup sourceLookup, Set<String> ignoredFields) throws IOException {
+    public Map<String, DocumentField> retrieve(int docId, Set<String> ignoredFields) throws IOException {
         Map<String, DocumentField> documentFields = new HashMap<>();
         for (FieldContext context : fieldContexts) {
             String field = context.fieldName;
@@ -92,7 +91,7 @@ public Map<String, DocumentField> retrieve(SourceLookup sourceLookup, Set<String
             }
 
             ValueFetcher valueFetcher = context.valueFetcher;
-            List<Object> parsedValues = valueFetcher.fetchValues(sourceLookup);
+            List<Object> parsedValues = valueFetcher.fetchValues(docId);
 
             if (parsedValues.isEmpty() == false) {
                 documentFields.put(field, new DocumentField(field, parsedValues));

diff --git a/server/src/test/java/org/elasticsearch/index/mapper/ExternalMapper.java b/server/src/test/java/org/elasticsearch/index/mapper/ExternalMapper.java
@@ -203,7 +203,7 @@ protected void parseCreateField(ParseContext context) throws IOException {
 
     @Override
     public ValueFetcher valueFetcher(MapperService mapperService, SearchLookup searchLookup, String format) {
-        return new SourceValueFetcher(name(), mapperService, parsesArrayValue()) {
+        return new SourceValueFetcher(name(), mapperService, searchLookup.source(), parsesArrayValue()) {
             @Override
             protected Object parseSourceValue(Object value) {
                 return value;

diff --git a/server/src/test/java/org/elasticsearch/index/mapper/FakeStringFieldMapper.java b/server/src/test/java/org/elasticsearch/index/mapper/FakeStringFieldMapper.java
@@ -136,7 +136,7 @@ protected void parseCreateField(ParseContext context) throws IOException {
 
     @Override
     public ValueFetcher valueFetcher(MapperService mapperService, SearchLookup searchLookup, String format) {
-        return new SourceValueFetcher(name(), mapperService, parsesArrayValue()) {
+        return new SourceValueFetcher(name(), mapperService, searchLookup.source(), parsesArrayValue()) {
             @Override
             protected String parseSourceValue(Object value) {
                 return value.toString();

diff --git a/server/src/test/java/org/elasticsearch/search/fetch/subphase/FieldValueRetrieverTests.java b/server/src/test/java/org/elasticsearch/search/fetch/subphase/FieldValueRetrieverTests.java
@@ -26,7 +26,7 @@
 import org.elasticsearch.common.xcontent.XContentFactory;
 import org.elasticsearch.index.IndexService;
 import org.elasticsearch.index.mapper.MapperService;
-import org.elasticsearch.search.lookup.SourceLookup;
+import org.elasticsearch.search.lookup.SearchLookup;
 import org.elasticsearch.test.ESSingleNodeTestCase;
 
 import java.io.IOException;
@@ -370,11 +370,11 @@ private Map<String, DocumentField> retrieveFields(MapperService mapperService, X
     private Map<String, DocumentField> retrieveFields(MapperService mapperService, XContentBuilder source, List<FieldAndFormat> fields)
         throws IOException {
 
-        SourceLookup sourceLookup = new SourceLookup();
-        sourceLookup.setSource(BytesReference.bytes(source));
+        SearchLookup lookup = new SearchLookup(mapperService, null);
+        lookup.source().setSource(BytesReference.bytes(source));
 
-        FieldValueRetriever fetchFieldsLookup = FieldValueRetriever.create(mapperService, null, fields);
-        return fetchFieldsLookup.retrieve(sourceLookup, Set.of());
+        FieldValueRetriever fetchFieldsLookup = FieldValueRetriever.create(mapperService, lookup, fields);
+        return fetchFieldsLookup.retrieve(0, Set.of());
     }
 
     public MapperService createMapperService() throws IOException {