Fix string type

Author: pquentin

output/openapi/elasticsearch-openapi.json

@@ -23,7 +23,7 @@ import { InnerHits } from '@global/search/_types/hits'
 import { QueryBase, QueryContainer } from './query_dsl/abstractions'
 
 /* Byte vectors can be hex-encoded strings */
-export type QueryVector = float[] | string[]
+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 */