Fix: Primitive type attribute for primaryTerm and seqNo

Author: lorenzomalla

java-client/src/main/java/co/elastic/clients/elasticsearch/_types/WriteResponseBase.java

@@ -54,11 +54,11 @@ public abstract class WriteResponseBase implements JsonpSerializable {
 
 	private final String index;
 
-	private final long primaryTerm;
+	private final Long primaryTerm;
 
 	private final Result result;
 
-	private final long seqNo;
+	private final Long seqNo;
 
 	private final ShardStatistics shards;