diff --git a/output/openapi/elasticsearch-serverless-openapi.json b/output/openapi/elasticsearch-serverless-openapi.json
index 24bda6f4db..be4b736b06 100644
--- a/output/openapi/elasticsearch-serverless-openapi.json
+++ b/output/openapi/elasticsearch-serverless-openapi.json
@@ -16622,10 +16622,7 @@
                 "type": "object",
                 "properties": {
                   "synonyms": {
-                    "type": "array",
-                    "items": {
-                      "$ref": "#/components/schemas/synonyms._types:SynonymString"
-                    }
+                    "$ref": "#/components/schemas/synonyms._types:SynonymString"
                   }
                 },
                 "required": [
diff --git a/output/schema/schema.json b/output/schema/schema.json
index 1a8faf8c4b..4e94e19611 100644
--- a/output/schema/schema.json
+++ b/output/schema/schema.json
@@ -186142,13 +186142,10 @@
             "name": "synonyms",
             "required": true,
             "type": {
-              "kind": "array_of",
-              "value": {
-                "kind": "instance_of",
-                "type": {
-                  "name": "SynonymString",
-                  "namespace": "synonyms._types"
-                }
+              "kind": "instance_of",
+              "type": {
+                "name": "SynonymString",
+                "namespace": "synonyms._types"
               }
             }
           }
diff --git a/output/typescript/types.ts b/output/typescript/types.ts
index 487c9294f8..9498f1d415 100644
--- a/output/typescript/types.ts
+++ b/output/typescript/types.ts
@@ -17668,7 +17668,7 @@ export interface SynonymsPutSynonymRuleRequest extends RequestBase {
   set_id: Id
   rule_id: Id
   body?: {
-    synonyms: SynonymsSynonymString[]
+    synonyms: SynonymsSynonymString
   }
 }
 
diff --git a/specification/synonyms/put_synonym_rule/SynonymRulePutRequest.ts b/specification/synonyms/put_synonym_rule/SynonymRulePutRequest.ts
index bae6a60ae1..6da2fda220 100644
--- a/specification/synonyms/put_synonym_rule/SynonymRulePutRequest.ts
+++ b/specification/synonyms/put_synonym_rule/SynonymRulePutRequest.ts
@@ -42,6 +42,6 @@ export interface Request extends RequestBase {
    * The synonym rule information to update
    */
   body: {
-    synonyms: SynonymString[]
+    synonyms: SynonymString
   }
 }