diff --git a/output/openapi/elasticsearch-openapi.json b/output/openapi/elasticsearch-openapi.json
index 28dbc59793..344955ce3c 100644
--- a/output/openapi/elasticsearch-openapi.json
+++ b/output/openapi/elasticsearch-openapi.json
@@ -61531,17 +61531,10 @@
               },
               "functions": {
                 "description": "One or more functions that compute a new score for each document returned by the query.",
-                "oneOf": [
-                  {
-                    "$ref": "#/components/schemas/_types.query_dsl.FunctionScoreContainer"
-                  },
-                  {
-                    "type": "array",
-                    "items": {
-                      "$ref": "#/components/schemas/_types.query_dsl.FunctionScoreContainer"
-                    }
-                  }
-                ]
+                "type": "array",
+                "items": {
+                  "$ref": "#/components/schemas/_types.query_dsl.FunctionScoreContainer"
+                }
               },
               "max_boost": {
                 "description": "Restricts the new score to not exceed the provided limit.",
diff --git a/output/openapi/elasticsearch-serverless-openapi.json b/output/openapi/elasticsearch-serverless-openapi.json
index a14a33e7a8..68d188a72e 100644
--- a/output/openapi/elasticsearch-serverless-openapi.json
+++ b/output/openapi/elasticsearch-serverless-openapi.json
@@ -37763,17 +37763,10 @@
               },
               "functions": {
                 "description": "One or more functions that compute a new score for each document returned by the query.",
-                "oneOf": [
-                  {
-                    "$ref": "#/components/schemas/_types.query_dsl.FunctionScoreContainer"
-                  },
-                  {
-                    "type": "array",
-                    "items": {
-                      "$ref": "#/components/schemas/_types.query_dsl.FunctionScoreContainer"
-                    }
-                  }
-                ]
+                "type": "array",
+                "items": {
+                  "$ref": "#/components/schemas/_types.query_dsl.FunctionScoreContainer"
+                }
               },
               "max_boost": {
                 "description": "Restricts the new score to not exceed the provided limit.",
diff --git a/output/schema/schema.json b/output/schema/schema.json
index 227f3080ec..10d5e4bda2 100644
--- a/output/schema/schema.json
+++ b/output/schema/schema.json
@@ -91385,26 +91385,14 @@
           "name": "functions",
           "required": false,
           "type": {
-            "kind": "union_of",
-            "items": [
-              {
-                "kind": "instance_of",
-                "type": {
-                  "name": "FunctionScoreContainer",
-                  "namespace": "_types.query_dsl"
-                }
-              },
-              {
-                "kind": "array_of",
-                "value": {
-                  "kind": "instance_of",
-                  "type": {
-                    "name": "FunctionScoreContainer",
-                    "namespace": "_types.query_dsl"
-                  }
-                }
+            "kind": "array_of",
+            "value": {
+              "kind": "instance_of",
+              "type": {
+                "name": "FunctionScoreContainer",
+                "namespace": "_types.query_dsl"
               }
-            ]
+            }
           }
         },
         {
diff --git a/output/typescript/types.ts b/output/typescript/types.ts
index 6e22d8edac..2bf1edf279 100644
--- a/output/typescript/types.ts
+++ b/output/typescript/types.ts
@@ -6412,7 +6412,7 @@ export type QueryDslFunctionScoreMode = 'multiply' | 'sum' | 'avg' | 'first' | '
 
 export interface QueryDslFunctionScoreQuery extends QueryDslQueryBase {
   boost_mode?: QueryDslFunctionBoostMode
-  functions?: QueryDslFunctionScoreContainer | QueryDslFunctionScoreContainer[]
+  functions?: QueryDslFunctionScoreContainer[]
   max_boost?: double
   min_score?: double
   query?: QueryDslQueryContainer
@@ -6771,7 +6771,7 @@ export interface QueryDslQueryContainer {
   dis_max?: QueryDslDisMaxQuery
   distance_feature?: QueryDslDistanceFeatureQuery
   exists?: QueryDslExistsQuery
-  function_score?: QueryDslFunctionScoreQuery | QueryDslFunctionScoreContainer | QueryDslFunctionScoreContainer[]
+  function_score?: QueryDslFunctionScoreQuery | QueryDslFunctionScoreContainer[]
   fuzzy?: Partial<Record<Field, QueryDslFuzzyQuery | string | double | boolean>>
   geo_bounding_box?: QueryDslGeoBoundingBoxQuery
   geo_distance?: QueryDslGeoDistanceQuery
diff --git a/specification/_types/query_dsl/compound.ts b/specification/_types/query_dsl/compound.ts
index 1d08ab0a98..434f5918fc 100644
--- a/specification/_types/query_dsl/compound.ts
+++ b/specification/_types/query_dsl/compound.ts
@@ -115,7 +115,7 @@ export class FunctionScoreQuery extends QueryBase {
   /**
    * One or more functions that compute a new score for each document returned by the query.
    */
-  functions?: FunctionScoreContainer | FunctionScoreContainer[]
+  functions?: FunctionScoreContainer[]
   /**
    * Restricts the new score to not exceed the provided limit.
    */