Ensure that _exists queries on keyword fields use norms when they're available. (#33006)

server/src/main/java/org/elasticsearch/index/mapper/KeywordFieldMapper.java

@@ -28,6 +28,7 @@ import org.apache.lucene.index.IndexOptions;
 import org.apache.lucene.index.IndexableField;
 import org.apache.lucene.index.Term;
 import org.apache.lucene.search.DocValuesFieldExistsQuery;
+import org.apache.lucene.search.NormsFieldExistsQuery;
 import org.apache.lucene.search.Query;
 import org.apache.lucene.search.TermQuery;
 import org.apache.lucene.util.BytesRef;
@@ -166,7 +167,7 @@ public final class KeywordFieldMapper extends FieldMapper {
                     builder.ignoreAbove(XContentMapValues.nodeIntegerValue(propNode, -1));
                     iterator.remove();
                 } else if (propName.equals("norms")) {
-                    builder.omitNorms(XContentMapValues.nodeBooleanValue(propNode, "norms") == false);
+                    TypeParsers.parseNorms(builder, name, propNode);
                     iterator.remove();
                 } else if (propName.equals("eager_global_ordinals")) {
                     builder.eagerGlobalOrdinals(XContentMapValues.nodeBooleanValue(propNode, "eager_global_ordinals"));
@@ -256,8 +257,10 @@ public final class KeywordFieldMapper extends FieldMapper {
         public Query existsQuery(QueryShardContext context) {
             if (hasDocValues()) {
                 return new DocValuesFieldExistsQuery(name());
-            } else {
+            } else if (omitNorms()) {
                 return new TermQuery(new Term(FieldNamesFieldMapper.NAME, name()));
+            } else {
+                return new NormsFieldExistsQuery(name());
             }
         }
 
@@ -366,17 +369,19 @@ public final class KeywordFieldMapper extends FieldMapper {
 
         // convert to utf8 only once before feeding postings/dv/stored fields
         final BytesRef binaryValue = new BytesRef(value);
-        if (fieldType().indexOptions() != IndexOptions.NONE || fieldType().stored()) {
+        if (fieldType().indexOptions() != IndexOptions.NONE || fieldType().stored())  {
             Field field = new Field(fieldType().name(), binaryValue, fieldType());
             fields.add(field);
+
+            if (fieldType().hasDocValues() == false && fieldType().omitNorms()) {
+                createFieldNamesField(context, fields);
+            }
         }
+
         if (fieldType().hasDocValues()) {
             fields.add(new SortedSetDocValuesField(fieldType().name(), binaryValue));
-        } else if (fieldType().stored() || fieldType().indexOptions() != IndexOptions.NONE) {
-            createFieldNamesField(context, fields);
         }
     }
-
     @Override
     protected String contentType() {
         return CONTENT_TYPE;

server/src/main/java/org/elasticsearch/index/mapper/TypeParsers.java

@@ -122,8 +122,7 @@ public class TypeParsers {
         }
     }
 
-    public static void parseNorms(FieldMapper.Builder builder, String fieldName, Object propNode,
-                                     Mapper.TypeParser.ParserContext parserContext) {
+    public static void parseNorms(FieldMapper.Builder builder, String fieldName, Object propNode) {
         builder.omitNorms(XContentMapValues.nodeBooleanValue(propNode, fieldName + ".norms") == false);
     }
 
@@ -140,7 +139,7 @@ public class TypeParsers {
             final String propName = entry.getKey();
             final Object propNode = entry.getValue();
             if ("norms".equals(propName)) {
-                parseNorms(builder, name, propNode, parserContext);
+                parseNorms(builder, name, propNode);
                 iterator.remove();
             }
         }

server/src/test/java/org/elasticsearch/index/mapper/KeywordFieldMapperTests.java

@@ -321,11 +321,16 @@ public class KeywordFieldMapperTests extends ESSingleNodeTestCase {
 
     public void testEnableNorms() throws IOException {
         String mapping = Strings.toString(XContentFactory.jsonBuilder().startObject().startObject("type")
-                .startObject("properties").startObject("field").field("type", "keyword").field("norms", true).endObject().endObject()
-                .endObject().endObject());
+            .startObject("properties")
+                .startObject("field")
+                    .field("type", "keyword")
+                    .field("doc_values", false)
+                    .field("norms", true)
+                .endObject()
+            .endObject()
+        .endObject().endObject());
 
         DocumentMapper mapper = parser.parse("type", new CompressedXContent(mapping));
-
         assertEquals(mapping, mapper.mappingSource().toString());
 
         ParsedDocument doc = mapper.parse(SourceToParse.source("test", "type", "1", BytesReference
@@ -336,8 +341,11 @@ public class KeywordFieldMapperTests extends ESSingleNodeTestCase {
                 XContentType.JSON));
 
         IndexableField[] fields = doc.rootDoc().getFields("field");
-        assertEquals(2, fields.length);
+        assertEquals(1, fields.length);
         assertFalse(fields[0].fieldType().omitNorms());
+
+        IndexableField[] fieldNamesFields = doc.rootDoc().getFields(FieldNamesFieldMapper.NAME);
+        assertEquals(0, fieldNamesFields.length);
     }
 
     public void testNormalizer() throws IOException {

server/src/test/java/org/elasticsearch/index/mapper/KeywordFieldTypeTests.java

@@ -19,7 +19,6 @@
 package org.elasticsearch.index.mapper;
 
 import com.carrotsearch.randomizedtesting.generators.RandomStrings;
-
 import org.apache.lucene.analysis.Analyzer;
 import org.apache.lucene.analysis.LowerCaseFilter;
 import org.apache.lucene.analysis.TokenFilter;
@@ -28,9 +27,11 @@ import org.apache.lucene.analysis.Tokenizer;
 import org.apache.lucene.analysis.core.WhitespaceTokenizer;
 import org.apache.lucene.index.IndexOptions;
 import org.apache.lucene.index.Term;
-import org.apache.lucene.search.TermInSetQuery;
+import org.apache.lucene.search.DocValuesFieldExistsQuery;
 import org.apache.lucene.search.FuzzyQuery;
+import org.apache.lucene.search.NormsFieldExistsQuery;
 import org.apache.lucene.search.RegexpQuery;
+import org.apache.lucene.search.TermInSetQuery;
 import org.apache.lucene.search.TermQuery;
 import org.apache.lucene.util.BytesRef;
 import org.elasticsearch.common.lucene.Lucene;
@@ -132,6 +133,23 @@ public class KeywordFieldTypeTests extends FieldTypeTestCase {
         assertEquals("Cannot search on field [field] since it is not indexed.", e.getMessage());
     }
 
+    public void testExistsQuery() {
+        MappedFieldType ft = createDefaultFieldType();
+        ft.setName("field");
+
+        ft.setHasDocValues(true);
+        ft.setOmitNorms(true);
+        assertEquals(new DocValuesFieldExistsQuery("field"), ft.existsQuery(null));
+
+        ft.setHasDocValues(false);
+        ft.setOmitNorms(false);
+        assertEquals(new NormsFieldExistsQuery("field"), ft.existsQuery(null));
+
+        ft.setHasDocValues(false);
+        ft.setOmitNorms(true);
+        assertEquals(new TermQuery(new Term(FieldNamesFieldMapper.NAME, "field")), ft.existsQuery(null));
+    }
+
     public void testRegexpQuery() {
         MappedFieldType ft = createDefaultFieldType();
         ft.setName("field");