HSEARCH-4948 Register codec

backend/lucene/src/main/java/org/hibernate/search/backend/lucene/lowlevel/codec/impl/HibernateSearchLuceneCodec.java

@@ -15,14 +15,29 @@
 import org.apache.lucene.codecs.Codec;
 import org.apache.lucene.codecs.FilterCodec;
 import org.apache.lucene.codecs.KnnVectorsFormat;
+import org.apache.lucene.codecs.lucene95.Lucene95Codec;
 import org.apache.lucene.codecs.perfield.PerFieldKnnVectorsFormat;
 
 public class HibernateSearchLuceneCodec extends FilterCodec {
+
+	private static final Codec DEFAULT_CODEC = new Lucene95Codec();
+
 	private final KnnVectorsFormat knnVectorsFormat;
 
 	public HibernateSearchLuceneCodec(LuceneIndexModel model) {
-		super( HibernateSearchLuceneCodec.class.getSimpleName(), Codec.getDefault() );
-		this.knnVectorsFormat = new IndexModelBasedPerFieldKnnVectorsFormat( model );
+		this( new IndexModelBasedPerFieldKnnVectorsFormat( model ) );
+	}
+
+	public HibernateSearchLuceneCodec(KnnVectorsFormat knnVectorsFormat) {
+		super( HibernateSearchLuceneCodec.class.getSimpleName(), DEFAULT_CODEC );
+		this.knnVectorsFormat = knnVectorsFormat;
+	}
+
+	public HibernateSearchLuceneCodec() {
+		this( (KnnVectorsFormat) null );
+		// NOTE: we are not providing access to a PerFieldKnnVectorsFormat based on a model,
+		// since max connections and beam width parameters configured by vector format are only used by an index writer;
+		// and we also are crating and passing the codec to the writer ourselves.
 	}
 
 	@Override

backend/lucene/src/main/resources/META-INF/services/org.apache.lucene.codecs.Codec

@@ -0,0 +1 @@
+org.hibernate.search.backend.lucene.lowlevel.codec.impl.HibernateSearchLuceneCodec

backend/lucene/src/test/java/org/hibernate/search/backend/lucene/lowlevel/codec/impl/HibernateSearchLuceneCodecTest.java

@@ -0,0 +1,24 @@
+/*
+ * Hibernate Search, full-text search for your domain model
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later
+ * See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
+ */
+package org.hibernate.search.backend.lucene.lowlevel.codec.impl;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.junit.jupiter.api.Test;
+
+import org.apache.lucene.codecs.Codec;
+import org.apache.lucene.codecs.lucene95.Lucene95Codec;
+
+class HibernateSearchLuceneCodecTest {
+	@Test
+	void checkDefaultCodec() {
+		assertThat( Codec.getDefault() )
+				.isNotNull()
+				.extracting( Object::getClass )
+				.isEqualTo( Lucene95Codec.class );
+	}
+}