Fix class reference

Author: thecoop

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

@@ -31,7 +31,7 @@
 
 /**
  * A codec that tracks the length of the min and max written terms. Used to improve memory usage estimates in serverless, since
- * {@link org.apache.lucene.codecs.lucene90.blocktree.FieldReader} keeps an in-memory reference to the min and max term.
+ * {@link org.apache.lucene.codecs.lucene103.blocktree.FieldReader} keeps an in-memory reference to the min and max term.
  */
 public class TrackingPostingsInMemoryBytesCodec extends FilterCodec {
     public static final FeatureFlag TRACK_POSTINGS_IN_MEMORY_BYTES = new FeatureFlag("track_postings_in_memory_bytes");