diff --git a/output/openapi/elasticsearch-openapi.json b/output/openapi/elasticsearch-openapi.json
index 8548d89c18..043b7bb072 100644
--- a/output/openapi/elasticsearch-openapi.json
+++ b/output/openapi/elasticsearch-openapi.json
@@ -111534,10 +111534,7 @@
               }
             ]
           }
-        },
-        "required": [
-          "vocabulary"
-        ]
+        }
       },
       "ml._types.LearningToRankConfig": {
         "type": "object",
@@ -111678,10 +111675,7 @@
               }
             ]
           }
-        },
-        "required": [
-          "vocabulary"
-        ]
+        }
       },
       "ml._types.TextExpansionInferenceOptions": {
         "description": "Text expansion inference options",
@@ -111706,10 +111700,7 @@
               }
             ]
           }
-        },
-        "required": [
-          "vocabulary"
-        ]
+        }
       },
       "ml._types.QuestionAnsweringInferenceOptions": {
         "description": "Question answering inference options",
diff --git a/output/openapi/elasticsearch-serverless-openapi.json b/output/openapi/elasticsearch-serverless-openapi.json
index 41f5ee1f9c..ae53c739d8 100644
--- a/output/openapi/elasticsearch-serverless-openapi.json
+++ b/output/openapi/elasticsearch-serverless-openapi.json
@@ -73544,10 +73544,7 @@
               }
             ]
           }
-        },
-        "required": [
-          "vocabulary"
-        ]
+        }
       },
       "ml._types.LearningToRankConfig": {
         "type": "object",
@@ -73688,10 +73685,7 @@
               }
             ]
           }
-        },
-        "required": [
-          "vocabulary"
-        ]
+        }
       },
       "ml._types.TextExpansionInferenceOptions": {
         "description": "Text expansion inference options",
@@ -73716,10 +73710,7 @@
               }
             ]
           }
-        },
-        "required": [
-          "vocabulary"
-        ]
+        }
       },
       "ml._types.QuestionAnsweringInferenceOptions": {
         "description": "Question answering inference options",
diff --git a/output/schema/schema.json b/output/schema/schema.json
index e5a785409b..f85bcfdd80 100644
--- a/output/schema/schema.json
+++ b/output/schema/schema.json
@@ -194909,7 +194909,7 @@
         },
         {
           "name": "vocabulary",
-          "required": true,
+          "required": false,
           "type": {
             "kind": "instance_of",
             "type": {
@@ -199014,7 +199014,7 @@
         },
         {
           "name": "vocabulary",
-          "required": true,
+          "required": false,
           "type": {
             "kind": "instance_of",
             "type": {
@@ -199093,7 +199093,7 @@
         },
         {
           "name": "vocabulary",
-          "required": true,
+          "required": false,
           "type": {
             "kind": "instance_of",
             "type": {
diff --git a/output/typescript/types.ts b/output/typescript/types.ts
index 1ccd84bde5..f66841b132 100644
--- a/output/typescript/types.ts
+++ b/output/typescript/types.ts
@@ -16225,7 +16225,7 @@ export interface MlFillMaskInferenceOptions {
   num_top_classes?: integer
   tokenization?: MlTokenizationConfigContainer
   results_field?: string
-  vocabulary: MlVocabulary
+  vocabulary?: MlVocabulary
 }
 
 export interface MlFillMaskInferenceUpdateOptions {
@@ -16644,7 +16644,7 @@ export interface MlTextEmbeddingInferenceOptions {
   embedding_size?: integer
   tokenization?: MlTokenizationConfigContainer
   results_field?: string
-  vocabulary: MlVocabulary
+  vocabulary?: MlVocabulary
 }
 
 export interface MlTextEmbeddingInferenceUpdateOptions {
@@ -16655,7 +16655,7 @@ export interface MlTextEmbeddingInferenceUpdateOptions {
 export interface MlTextExpansionInferenceOptions {
   tokenization?: MlTokenizationConfigContainer
   results_field?: string
-  vocabulary: MlVocabulary
+  vocabulary?: MlVocabulary
 }
 
 export interface MlTextExpansionInferenceUpdateOptions {
diff --git a/specification/ml/_types/inference.ts b/specification/ml/_types/inference.ts
index 75aafa1f20..4f0c21caac 100644
--- a/specification/ml/_types/inference.ts
+++ b/specification/ml/_types/inference.ts
@@ -258,7 +258,7 @@ export class TextEmbeddingInferenceOptions {
   /** The field that is added to incoming documents to contain the inference prediction. Defaults to predicted_value. */
   results_field?: string
 
-  vocabulary: Vocabulary
+  vocabulary?: Vocabulary
 }
 
 /** Text expansion inference options */
@@ -267,7 +267,7 @@ export class TextExpansionInferenceOptions {
   tokenization?: TokenizationConfigContainer
   /** The field that is added to incoming documents to contain the inference prediction. Defaults to predicted_value. */
   results_field?: string
-  vocabulary: Vocabulary
+  vocabulary?: Vocabulary
 }
 
 /** Named entity recognition options */
@@ -295,7 +295,7 @@ export class FillMaskInferenceOptions {
   tokenization?: TokenizationConfigContainer
   /** The field that is added to incoming documents to contain the inference prediction. Defaults to predicted_value. */
   results_field?: string
-  vocabulary: Vocabulary
+  vocabulary?: Vocabulary
 }
 
 /** Question answering inference options */