diff --git a/clients/algoliasearch-client-java-2/algoliasearch-core/src/main/java/com/algolia/model/predict/ModelInstance.java b/clients/algoliasearch-client-java-2/algoliasearch-core/src/main/java/com/algolia/model/predict/ModelInstance.java
index e1a7061e1e..4f1ccae049 100644
--- a/clients/algoliasearch-client-java-2/algoliasearch-core/src/main/java/com/algolia/model/predict/ModelInstance.java
+++ b/clients/algoliasearch-client-java-2/algoliasearch-core/src/main/java/com/algolia/model/predict/ModelInstance.java
@@ -27,10 +27,10 @@ public class ModelInstance {
   private String index;
 
   @JsonProperty("modelAttributes")
-  private List<ModelAttributes> modelAttributes = new ArrayList<>();
+  private List<ModelAttributes> modelAttributes;
 
   @JsonProperty("contentAttributes")
-  private List<String> contentAttributes = new ArrayList<>();
+  private List<String> contentAttributes;
 
   @JsonProperty("lastTrained")
   private String lastTrained;
@@ -125,6 +125,9 @@ public ModelInstance setModelAttributes(List<ModelAttributes> modelAttributes) {
   }
 
   public ModelInstance addModelAttributes(ModelAttributes modelAttributesItem) {
+    if (this.modelAttributes == null) {
+      this.modelAttributes = new ArrayList<>();
+    }
     this.modelAttributes.add(modelAttributesItem);
     return this;
   }
@@ -134,7 +137,7 @@ public ModelInstance addModelAttributes(ModelAttributes modelAttributesItem) {
    *
    * @return modelAttributes
    */
-  @javax.annotation.Nonnull
+  @javax.annotation.Nullable
   public List<ModelAttributes> getModelAttributes() {
     return modelAttributes;
   }
@@ -145,6 +148,9 @@ public ModelInstance setContentAttributes(List<String> contentAttributes) {
   }
 
   public ModelInstance addContentAttributes(String contentAttributesItem) {
+    if (this.contentAttributes == null) {
+      this.contentAttributes = new ArrayList<>();
+    }
     this.contentAttributes.add(contentAttributesItem);
     return this;
   }
@@ -154,7 +160,7 @@ public ModelInstance addContentAttributes(String contentAttributesItem) {
    *
    * @return contentAttributes
    */
-  @javax.annotation.Nonnull
+  @javax.annotation.Nullable
   public List<String> getContentAttributes() {
     return contentAttributes;
   }
diff --git a/clients/algoliasearch-client-javascript/packages/predict/model/modelInstance.ts b/clients/algoliasearch-client-javascript/packages/predict/model/modelInstance.ts
index f6e48f77e7..04a32bebc7 100644
--- a/clients/algoliasearch-client-javascript/packages/predict/model/modelInstance.ts
+++ b/clients/algoliasearch-client-javascript/packages/predict/model/modelInstance.ts
@@ -23,9 +23,9 @@ export type ModelInstance = {
 
   index: string;
 
-  modelAttributes: ModelAttributes[];
+  modelAttributes?: ModelAttributes[];
 
-  contentAttributes: string[];
+  contentAttributes?: string[];
 
   /**
    * The date and time this model instance was last trained.
diff --git a/specs/bundled/predict.yml b/specs/bundled/predict.yml
index 155fd2c9a9..b8cec65f21 100644
--- a/specs/bundled/predict.yml
+++ b/specs/bundled/predict.yml
@@ -359,8 +359,6 @@ components:
         - type
         - sourceID
         - index
-        - modelAttributes
-        - contentAttributes
         - lastTrained
         - lastInference
         - modelStatus