diff --git a/output/openapi/elasticsearch-openapi.json b/output/openapi/elasticsearch-openapi.json
index 692f131b29..432b73d992 100644
--- a/output/openapi/elasticsearch-openapi.json
+++ b/output/openapi/elasticsearch-openapi.json
@@ -62965,10 +62965,17 @@
         ]
       },
       "_types.QueryVector": {
-        "type": "array",
-        "items": {
-          "type": "number"
-        }
+        "oneOf": [
+          {
+            "type": "array",
+            "items": {
+              "type": "number"
+            }
+          },
+          {
+            "type": "string"
+          }
+        ]
       },
       "_types.QueryVectorBuilder": {
         "type": "object",
diff --git a/output/openapi/elasticsearch-serverless-openapi.json b/output/openapi/elasticsearch-serverless-openapi.json
index d921f60720..778a64bdbf 100644
--- a/output/openapi/elasticsearch-serverless-openapi.json
+++ b/output/openapi/elasticsearch-serverless-openapi.json
@@ -39328,10 +39328,17 @@
         ]
       },
       "_types.QueryVector": {
-        "type": "array",
-        "items": {
-          "type": "number"
-        }
+        "oneOf": [
+          {
+            "type": "array",
+            "items": {
+              "type": "number"
+            }
+          },
+          {
+            "type": "string"
+          }
+        ]
       },
       "_types.QueryVectorBuilder": {
         "type": "object",
diff --git a/output/schema/schema.json b/output/schema/schema.json
index 923aee4294..603bcad9f9 100644
--- a/output/schema/schema.json
+++ b/output/schema/schema.json
@@ -54583,7 +54583,7 @@
           }
         }
       ],
-      "specLocation": "_types/Knn.ts#L69-L97"
+      "specLocation": "_types/Knn.ts#L70-L98"
     },
     {
       "kind": "interface",
@@ -54878,7 +54878,7 @@
           }
         }
       ],
-      "specLocation": "_types/Knn.ts#L35-L67"
+      "specLocation": "_types/Knn.ts#L36-L68"
     },
     {
       "kind": "interface",
@@ -56341,16 +56341,28 @@
         "name": "QueryVector",
         "namespace": "_types"
       },
-      "specLocation": "_types/Knn.ts#L25-L25",
+      "specLocation": "_types/Knn.ts#L26-L26",
       "type": {
-        "kind": "array_of",
-        "value": {
-          "kind": "instance_of",
-          "type": {
-            "name": "float",
-            "namespace": "_types"
+        "kind": "union_of",
+        "items": [
+          {
+            "kind": "array_of",
+            "value": {
+              "kind": "instance_of",
+              "type": {
+                "name": "float",
+                "namespace": "_types"
+              }
+            }
+          },
+          {
+            "kind": "instance_of",
+            "type": {
+              "name": "string",
+              "namespace": "_builtins"
+            }
           }
-        }
+        ]
       }
     },
     {
@@ -56372,7 +56384,7 @@
           }
         }
       ],
-      "specLocation": "_types/Knn.ts#L99-L102",
+      "specLocation": "_types/Knn.ts#L100-L103",
       "variants": {
         "kind": "container"
       }
@@ -56877,7 +56889,7 @@
           }
         }
       ],
-      "specLocation": "_types/Knn.ts#L30-L33"
+      "specLocation": "_types/Knn.ts#L31-L34"
     },
     {
       "kind": "interface",
@@ -59285,7 +59297,7 @@
           }
         }
       ],
-      "specLocation": "_types/Knn.ts#L104-L113"
+      "specLocation": "_types/Knn.ts#L105-L114"
     },
     {
       "kind": "interface",
diff --git a/output/typescript/types.ts b/output/typescript/types.ts
index 8c95fa5b9e..961c3da98f 100644
--- a/output/typescript/types.ts
+++ b/output/typescript/types.ts
@@ -2718,7 +2718,7 @@ export interface QueryCacheStats {
   total_count: long
 }
 
-export type QueryVector = float[]
+export type QueryVector = float[] | string
 
 export interface QueryVectorBuilder {
   text_embedding?: TextEmbedding
diff --git a/specification/_types/Knn.ts b/specification/_types/Knn.ts
index 541411301f..26b0eec20e 100644
--- a/specification/_types/Knn.ts
+++ b/specification/_types/Knn.ts
@@ -22,7 +22,8 @@ import { float, integer } from '@_types/Numeric'
 import { InnerHits } from '@global/search/_types/hits'
 import { QueryBase, QueryContainer } from './query_dsl/abstractions'
 
-export type QueryVector = float[]
+/* Byte vectors can be hex-encoded strings */
+export type QueryVector = float[] | string
 
 /* KnnSearch (used in kNN search) and KnnQuery (ued in kNN queries) are close
  * but different enough to require different classes */