diff --git a/CHANGELOG.md b/CHANGELOG.md
index f615a78fb9..7bc3019dfe 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 ### Documentation
 * Fix sed command in DEVELOPER_GUIDE.md to append a new line character '\n'. [#2181](https://github.com/opensearch-project/k-NN/pull/2181)
 ### Maintenance
+* Fix lucene codec after lucene version bumped to 9.12. [#2195](https://github.com/opensearch-project/k-NN/pull/2195)
 ### Refactoring
 * Does not create additional KNNVectorValues in NativeEngines990KNNVectorWriter when quantization is not needed [#2133](https://github.com/opensearch-project/k-NN/pull/2133)
 
diff --git a/src/main/java/org/opensearch/knn/index/codec/KNN9120Codec/KNN9120Codec.java b/src/main/java/org/opensearch/knn/index/codec/KNN9120Codec/KNN9120Codec.java
new file mode 100644
index 0000000000..a370197ecc
--- /dev/null
+++ b/src/main/java/org/opensearch/knn/index/codec/KNN9120Codec/KNN9120Codec.java
@@ -0,0 +1,61 @@
+/*
+ * Copyright OpenSearch Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package org.opensearch.knn.index.codec.KNN9120Codec;
+
+import lombok.Builder;
+import org.apache.lucene.codecs.Codec;
+import org.apache.lucene.codecs.CompoundFormat;
+import org.apache.lucene.codecs.DocValuesFormat;
+import org.apache.lucene.codecs.FilterCodec;
+import org.apache.lucene.codecs.KnnVectorsFormat;
+import org.apache.lucene.codecs.perfield.PerFieldKnnVectorsFormat;
+import org.opensearch.knn.index.codec.KNNCodecVersion;
+import org.opensearch.knn.index.codec.KNNFormatFacade;
+
+/**
+ * KNN Codec that wraps the Lucene Codec which is part of Lucene 9.12
+ */
+public class KNN9120Codec extends FilterCodec {
+    private static final KNNCodecVersion VERSION = KNNCodecVersion.V_9_12_0;
+    private final KNNFormatFacade knnFormatFacade;
+    private final PerFieldKnnVectorsFormat perFieldKnnVectorsFormat;
+
+    /**
+     * No arg constructor that uses Lucene99 as the delegate
+     */
+    public KNN9120Codec() {
+        this(VERSION.getDefaultCodecDelegate(), VERSION.getPerFieldKnnVectorsFormat());
+    }
+
+    /**
+     * Sole constructor. When subclassing this codec, create a no-arg ctor and pass the delegate codec
+     * and a unique name to this ctor.
+     *
+     * @param delegate codec that will perform all operations this codec does not override
+     * @param knnVectorsFormat per field format for KnnVector
+     */
+    @Builder
+    protected KNN9120Codec(Codec delegate, PerFieldKnnVectorsFormat knnVectorsFormat) {
+        super(VERSION.getCodecName(), delegate);
+        knnFormatFacade = VERSION.getKnnFormatFacadeSupplier().apply(delegate);
+        perFieldKnnVectorsFormat = knnVectorsFormat;
+    }
+
+    @Override
+    public DocValuesFormat docValuesFormat() {
+        return knnFormatFacade.docValuesFormat();
+    }
+
+    @Override
+    public CompoundFormat compoundFormat() {
+        return knnFormatFacade.compoundFormat();
+    }
+
+    @Override
+    public KnnVectorsFormat knnVectorsFormat() {
+        return perFieldKnnVectorsFormat;
+    }
+}
diff --git a/src/main/java/org/opensearch/knn/index/codec/KNN990Codec/NativeEngines990KnnVectorsWriter.java b/src/main/java/org/opensearch/knn/index/codec/KNN990Codec/NativeEngines990KnnVectorsWriter.java
index 2f22565c98..e33519130b 100644
--- a/src/main/java/org/opensearch/knn/index/codec/KNN990Codec/NativeEngines990KnnVectorsWriter.java
+++ b/src/main/java/org/opensearch/knn/index/codec/KNN990Codec/NativeEngines990KnnVectorsWriter.java
@@ -67,7 +67,7 @@ public NativeEngines990KnnVectorsWriter(SegmentWriteState segmentWriteState, Fla
     public KnnFieldVectorsWriter<?> addField(final FieldInfo fieldInfo) throws IOException {
         final NativeEngineFieldVectorsWriter<?> newField = NativeEngineFieldVectorsWriter.create(fieldInfo, segmentWriteState.infoStream);
         fields.add(newField);
-        return flatVectorsWriter.addField(fieldInfo, newField);
+        return flatVectorsWriter.addField(fieldInfo);
     }
 
     /**
diff --git a/src/main/java/org/opensearch/knn/index/codec/KNNCodecVersion.java b/src/main/java/org/opensearch/knn/index/codec/KNNCodecVersion.java
index 419505aa20..4bbeceffb3 100644
--- a/src/main/java/org/opensearch/knn/index/codec/KNNCodecVersion.java
+++ b/src/main/java/org/opensearch/knn/index/codec/KNNCodecVersion.java
@@ -12,12 +12,14 @@
 import org.apache.lucene.backward_codecs.lucene94.Lucene94Codec;
 import org.apache.lucene.codecs.Codec;
 import org.apache.lucene.backward_codecs.lucene95.Lucene95Codec;
-import org.apache.lucene.codecs.lucene99.Lucene99Codec;
+import org.apache.lucene.backward_codecs.lucene99.Lucene99Codec;
+import org.apache.lucene.codecs.lucene912.Lucene912Codec;
 import org.apache.lucene.codecs.perfield.PerFieldKnnVectorsFormat;
 import org.opensearch.index.mapper.MapperService;
 import org.opensearch.knn.index.codec.KNN80Codec.KNN80CompoundFormat;
 import org.opensearch.knn.index.codec.KNN80Codec.KNN80DocValuesFormat;
 import org.opensearch.knn.index.codec.KNN910Codec.KNN910Codec;
+import org.opensearch.knn.index.codec.KNN9120Codec.KNN9120Codec;
 import org.opensearch.knn.index.codec.KNN920Codec.KNN920Codec;
 import org.opensearch.knn.index.codec.KNN920Codec.KNN920PerFieldKnnVectorsFormat;
 import org.opensearch.knn.index.codec.KNN940Codec.KNN940Codec;
@@ -110,9 +112,24 @@ public enum KNNCodecVersion {
             .knnVectorsFormat(new KNN990PerFieldKnnVectorsFormat(Optional.ofNullable(mapperService)))
             .build(),
         KNN990Codec::new
+    ),
+
+    V_9_12_0(
+        "KNN990Codec",
+        new Lucene912Codec(),
+        new KNN990PerFieldKnnVectorsFormat(Optional.empty()),
+        (delegate) -> new KNNFormatFacade(
+            new KNN80DocValuesFormat(delegate.docValuesFormat()),
+            new KNN80CompoundFormat(delegate.compoundFormat())
+        ),
+        (userCodec, mapperService) -> KNN9120Codec.builder()
+            .delegate(userCodec)
+            .knnVectorsFormat(new KNN990PerFieldKnnVectorsFormat(Optional.ofNullable(mapperService)))
+            .build(),
+        KNN9120Codec::new
     );
 
-    private static final KNNCodecVersion CURRENT = V_9_9_0;
+    private static final KNNCodecVersion CURRENT = V_9_12_0;
 
     private final String codecName;
     private final Codec defaultCodecDelegate;