diff --git a/java-client/src/main/java/org/opensearch/client/opensearch/_types/mapping/KnnVectorMethod.java b/java-client/src/main/java/org/opensearch/client/opensearch/_types/mapping/KnnVectorMethod.java
index e53d9a5601..5bf4786523 100644
--- a/java-client/src/main/java/org/opensearch/client/opensearch/_types/mapping/KnnVectorMethod.java
+++ b/java-client/src/main/java/org/opensearch/client/opensearch/_types/mapping/KnnVectorMethod.java
@@ -202,10 +202,12 @@ protected void serializeInternal(JsonGenerator generator, JsonpMapper mapper) {
 
         if (this.parameters != null) {
             generator.writeKey("parameters");
+            generator.writeStartObject();
             for (Map.Entry<String, JsonData> item0 : this.parameters.entrySet()) {
                 generator.writeKey(item0.getKey());
                 item0.getValue().serialize(generator, mapper);
             }
+            generator.writeEnd();
         }
 
     }
diff --git a/java-client/src/main/java/org/opensearch/client/opensearch/indices/IndexSettings.java b/java-client/src/main/java/org/opensearch/client/opensearch/indices/IndexSettings.java
index e0ec17254a..14f6697f55 100644
--- a/java-client/src/main/java/org/opensearch/client/opensearch/indices/IndexSettings.java
+++ b/java-client/src/main/java/org/opensearch/client/opensearch/indices/IndexSettings.java
@@ -1066,7 +1066,7 @@ protected void serializeInternal(JsonGenerator generator, JsonpMapper mapper) {
 
 		}
 		if (this.knnAlgoParamEfSearch != null) {
-			generator.writeKey("knn.algo_param_ef_search");
+			generator.writeKey("knn.algo_param.ef_search");
 			generator.write(this.knnAlgoParamEfSearch);
 
 		}
diff --git a/java-client/src/test/java/org/opensearch/client/opensearch/integTest/AbstractKnnIT.java b/java-client/src/test/java/org/opensearch/client/opensearch/integTest/AbstractKnnIT.java
index 29872f437a..b34b67d8ea 100644
--- a/java-client/src/test/java/org/opensearch/client/opensearch/integTest/AbstractKnnIT.java
+++ b/java-client/src/test/java/org/opensearch/client/opensearch/integTest/AbstractKnnIT.java
@@ -73,13 +73,17 @@ public void testCanIndexAndSearchKnn() throws Exception {
 
         assertEquals(2, hits.size());
         assertEquals(5.5f, hits.get(0).source().price, 0.01f);
-        assertEquals(4.4f, hits.get(1).source().price, 0.01f);
+        assertEquals(10.3f, hits.get(1).source().price, 0.01f);
     }
 
     private static class Doc {
         public float[] vector;
         public float price;
 
+        Doc() {
+
+        }
+
         Doc(float[] vector, float price) {
             this.vector = vector;
             this.price = price;