Fix ml.put_trained_model API (#5363)

(cherry picked from commit 4c1d1a7)

Author: pquentin

output/openapi/elasticsearch-openapi.json

@@ -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 */