diff --git a/output/openapi/elasticsearch-openapi.json b/output/openapi/elasticsearch-openapi.json
index 415666fdcd..6148c10cfe 100644
--- a/output/openapi/elasticsearch-openapi.json
+++ b/output/openapi/elasticsearch-openapi.json
@@ -70195,10 +70195,17 @@
               },
               "percents": {
                 "description": "The percentiles to calculate.",
-                "type": "array",
-                "items": {
-                  "type": "number"
-                }
+                "oneOf": [
+                  {
+                    "type": "number"
+                  },
+                  {
+                    "type": "array",
+                    "items": {
+                      "type": "number"
+                    }
+                  }
+                ]
               },
               "hdr": {
                 "description": "Uses the alternative High Dynamic Range Histogram algorithm to calculate percentiles.",
diff --git a/output/openapi/elasticsearch-serverless-openapi.json b/output/openapi/elasticsearch-serverless-openapi.json
index cf5429bf8d..86e419a08f 100644
--- a/output/openapi/elasticsearch-serverless-openapi.json
+++ b/output/openapi/elasticsearch-serverless-openapi.json
@@ -46410,10 +46410,17 @@
               },
               "percents": {
                 "description": "The percentiles to calculate.",
-                "type": "array",
-                "items": {
-                  "type": "number"
-                }
+                "oneOf": [
+                  {
+                    "type": "number"
+                  },
+                  {
+                    "type": "array",
+                    "items": {
+                      "type": "number"
+                    }
+                  }
+                ]
               },
               "hdr": {
                 "description": "Uses the alternative High Dynamic Range Histogram algorithm to calculate percentiles.",
diff --git a/output/schema/schema.json b/output/schema/schema.json
index 0637f49b48..5fc5261a1f 100644
--- a/output/schema/schema.json
+++ b/output/schema/schema.json
@@ -69556,14 +69556,26 @@
           "name": "percents",
           "required": false,
           "type": {
-            "kind": "array_of",
-            "value": {
-              "kind": "instance_of",
-              "type": {
-                "name": "double",
-                "namespace": "_types"
+            "kind": "union_of",
+            "items": [
+              {
+                "kind": "instance_of",
+                "type": {
+                  "name": "double",
+                  "namespace": "_types"
+                }
+              },
+              {
+                "kind": "array_of",
+                "value": {
+                  "kind": "instance_of",
+                  "type": {
+                    "name": "double",
+                    "namespace": "_types"
+                  }
+                }
               }
-            }
+            ]
           }
         },
         {
diff --git a/output/typescript/types.ts b/output/typescript/types.ts
index 5da2be1259..27e6442d87 100644
--- a/output/typescript/types.ts
+++ b/output/typescript/types.ts
@@ -4175,7 +4175,7 @@ export interface AggregationsPercentilesAggregateBase extends AggregationsAggreg
 
 export interface AggregationsPercentilesAggregation extends AggregationsFormatMetricAggregationBase {
   keyed?: boolean
-  percents?: double[]
+  percents?: double | double[]
   hdr?: AggregationsHdrMethod
   tdigest?: AggregationsTDigest
 }
diff --git a/specification/_types/aggregations/metric.ts b/specification/_types/aggregations/metric.ts
index fb6a9b6775..d1e833fce6 100644
--- a/specification/_types/aggregations/metric.ts
+++ b/specification/_types/aggregations/metric.ts
@@ -227,7 +227,7 @@ export class PercentilesAggregation extends FormatMetricAggregationBase {
   /**
    * The percentiles to calculate.
    */
-  percents?: double[]
+  percents?: double | double[]
   /**
    * Uses the alternative High Dynamic Range Histogram algorithm to calculate percentiles.
    */