Fix mapper codec tests (#111101)

This fixes some tests. But I am not convinced that the delegating is correct with regards to per field formats

closes: #111043
closes: #111044
closes: #111045
closes: #111046
closes: #111047

muted-tests.yml

@@ -91,9 +91,6 @@ tests:
 - class: org.elasticsearch.action.search.KnnSearchSingleNodeTests
   method: testKnnSearchAction
   issue: https://github.com/elastic/elasticsearch/issues/111072
-- class: org.elasticsearch.index.mapper.vectors.DenseVectorFieldMapperTests
-  method: testKnnQuantizedFlatVectorsFormat
-  issue: https://github.com/elastic/elasticsearch/issues/111044
 - class: org.elasticsearch.xpack.esql.spatial.SpatialPushDownGeoPointIT
   method: testPushedDownQueriesSingleValue
   issue: https://github.com/elastic/elasticsearch/issues/111084

server/src/main/java/org/elasticsearch/index/codec/CodecService.java

@@ -106,5 +106,9 @@ public class CodecService {
             return deduplicatingFieldInfosFormat;
         }
 
+        public final Codec delegate() {
+            return delegate;
+        }
+
     }
 }

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

@@ -152,6 +152,9 @@ public class CompletionFieldMapperTests extends MapperTestCase {
             assertThat(codec, instanceOf(PerFieldMapperCodec.class));
             assertThat(((PerFieldMapperCodec) codec).getPostingsFormatForField("field"), instanceOf(Completion99PostingsFormat.class));
         } else {
+            if (codec instanceof CodecService.DeduplicateFieldInfosCodec deduplicateFieldInfosCodec) {
+                codec = deduplicateFieldInfosCodec.delegate();
+            }
             assertThat(codec, instanceOf(LegacyPerFieldMapperCodec.class));
             assertThat(
                 ((LegacyPerFieldMapperCodec) codec).getPostingsFormatForField("field"),

server/src/test/java/org/elasticsearch/index/mapper/vectors/DenseVectorFieldMapperTests.java

@@ -1842,6 +1842,9 @@ public class DenseVectorFieldMapperTests extends MapperTestCase {
             assertThat(codec, instanceOf(PerFieldMapperCodec.class));
             knnVectorsFormat = ((PerFieldMapperCodec) codec).getKnnVectorsFormatForField("field");
         } else {
+            if (codec instanceof CodecService.DeduplicateFieldInfosCodec deduplicateFieldInfosCodec) {
+                codec = deduplicateFieldInfosCodec.delegate();
+            }
             assertThat(codec, instanceOf(LegacyPerFieldMapperCodec.class));
             knnVectorsFormat = ((LegacyPerFieldMapperCodec) codec).getKnnVectorsFormatForField("field");
         }
@@ -1877,6 +1880,9 @@ public class DenseVectorFieldMapperTests extends MapperTestCase {
                 assertThat(codec, instanceOf(PerFieldMapperCodec.class));
                 knnVectorsFormat = ((PerFieldMapperCodec) codec).getKnnVectorsFormatForField("field");
             } else {
+                if (codec instanceof CodecService.DeduplicateFieldInfosCodec deduplicateFieldInfosCodec) {
+                    codec = deduplicateFieldInfosCodec.delegate();
+                }
                 assertThat(codec, instanceOf(LegacyPerFieldMapperCodec.class));
                 knnVectorsFormat = ((LegacyPerFieldMapperCodec) codec).getKnnVectorsFormatForField("field");
             }
@@ -1920,6 +1926,9 @@ public class DenseVectorFieldMapperTests extends MapperTestCase {
             assertThat(codec, instanceOf(PerFieldMapperCodec.class));
             knnVectorsFormat = ((PerFieldMapperCodec) codec).getKnnVectorsFormatForField("field");
         } else {
+            if (codec instanceof CodecService.DeduplicateFieldInfosCodec deduplicateFieldInfosCodec) {
+                codec = deduplicateFieldInfosCodec.delegate();
+            }
             assertThat(codec, instanceOf(LegacyPerFieldMapperCodec.class));
             knnVectorsFormat = ((LegacyPerFieldMapperCodec) codec).getKnnVectorsFormatForField("field");
         }
@@ -1961,6 +1970,9 @@ public class DenseVectorFieldMapperTests extends MapperTestCase {
             assertThat(codec, instanceOf(PerFieldMapperCodec.class));
             knnVectorsFormat = ((PerFieldMapperCodec) codec).getKnnVectorsFormatForField("field");
         } else {
+            if (codec instanceof CodecService.DeduplicateFieldInfosCodec deduplicateFieldInfosCodec) {
+                codec = deduplicateFieldInfosCodec.delegate();
+            }
             assertThat(codec, instanceOf(LegacyPerFieldMapperCodec.class));
             knnVectorsFormat = ((LegacyPerFieldMapperCodec) codec).getKnnVectorsFormatForField("field");
         }