diff --git a/specification/_global/bulk/BulkRequest.ts b/specification/_global/bulk/BulkRequest.ts
index d212e71bac..e03923ab3b 100644
--- a/specification/_global/bulk/BulkRequest.ts
+++ b/specification/_global/bulk/BulkRequest.ts
@@ -97,7 +97,7 @@ export interface Request<TDocument, TPartialDocument> extends RequestBase {
   // This declaration captures action_and_meta_data (OperationContainer) and the two kinds of sources
   // that can follow: an update action for update operations and anything for index or create operations.
   // /!\ must be kept in sync with BulkMonitoringRequest
-  body?: Array<
+  body: Array<
     OperationContainer | UpdateAction<TDocument, TPartialDocument> | TDocument
   >
 }
diff --git a/specification/_global/create/CreateRequest.ts b/specification/_global/create/CreateRequest.ts
index 31badee6d4..212a22a3cf 100644
--- a/specification/_global/create/CreateRequest.ts
+++ b/specification/_global/create/CreateRequest.ts
@@ -91,5 +91,5 @@ export interface Request<TDocument> extends RequestBase {
   /**
    * Request body contains the JSON source for the document data.
    * @codegen_name document */
-  body?: TDocument
+  body: TDocument
 }
diff --git a/specification/_global/index/IndexRequest.ts b/specification/_global/index/IndexRequest.ts
index 4056890c48..0dac654546 100644
--- a/specification/_global/index/IndexRequest.ts
+++ b/specification/_global/index/IndexRequest.ts
@@ -113,5 +113,5 @@ export interface Request<TDocument> extends RequestBase {
   /**
    * Request body contains the JSON source for the document data.
    */
-  body?: TDocument
+  body: TDocument
 }
diff --git a/specification/_global/msearch/MultiSearchRequest.ts b/specification/_global/msearch/MultiSearchRequest.ts
index a4394c6af5..030f95101b 100644
--- a/specification/_global/msearch/MultiSearchRequest.ts
+++ b/specification/_global/msearch/MultiSearchRequest.ts
@@ -92,5 +92,5 @@ export interface Request extends RequestBase {
     typed_keys?: boolean
   }
   /** @codegen_name searches */
-  body?: Array<RequestItem>
+  body: Array<RequestItem>
 }
diff --git a/specification/fleet/msearch/MultiSearchRequest.ts b/specification/fleet/msearch/MultiSearchRequest.ts
index aa99552f7e..759da03855 100644
--- a/specification/fleet/msearch/MultiSearchRequest.ts
+++ b/specification/fleet/msearch/MultiSearchRequest.ts
@@ -111,5 +111,5 @@ export interface Request extends RequestBase {
     allow_partial_search_results?: boolean
   }
   /** @codegen_name searches */
-  body?: Array<RequestItem>
+  body: Array<RequestItem>
 }
diff --git a/specification/indices/downsample/Request.ts b/specification/indices/downsample/Request.ts
index c3b30b1baf..b603bf1d60 100644
--- a/specification/indices/downsample/Request.ts
+++ b/specification/indices/downsample/Request.ts
@@ -40,5 +40,5 @@ export interface Request extends RequestBase {
     target_index: IndexName
   }
   /** @codegen_name config */
-  body?: DownsampleConfig
+  body: DownsampleConfig
 }
diff --git a/specification/ml/validate_detector/MlValidateDetectorRequest.ts b/specification/ml/validate_detector/MlValidateDetectorRequest.ts
index 8c2656fe75..fc586c5fb2 100644
--- a/specification/ml/validate_detector/MlValidateDetectorRequest.ts
+++ b/specification/ml/validate_detector/MlValidateDetectorRequest.ts
@@ -27,5 +27,5 @@ import { RequestBase } from '@_types/Base'
  */
 export interface Request extends RequestBase {
   /** @codegen_name detector */
-  body?: Detector
+  body: Detector
 }
diff --git a/specification/monitoring/bulk/BulkMonitoringRequest.ts b/specification/monitoring/bulk/BulkMonitoringRequest.ts
index 44c5543940..0aee558b84 100644
--- a/specification/monitoring/bulk/BulkMonitoringRequest.ts
+++ b/specification/monitoring/bulk/BulkMonitoringRequest.ts
@@ -53,7 +53,7 @@ export interface Request<TDocument, TPartialDocument> extends RequestBase {
   /** @codegen_name operations */
   // BulkMonitoringRequest accepts a body request that has the same format as the BulkRequest
   // See BulkRequest for additional notes.
-  body?: Array<
+  body: Array<
     OperationContainer | UpdateAction<TDocument, TPartialDocument> | TDocument
   >
 }
diff --git a/specification/security/put_privileges/SecurityPutPrivilegesRequest.ts b/specification/security/put_privileges/SecurityPutPrivilegesRequest.ts
index 62f05af563..ea5414d537 100644
--- a/specification/security/put_privileges/SecurityPutPrivilegesRequest.ts
+++ b/specification/security/put_privileges/SecurityPutPrivilegesRequest.ts
@@ -33,5 +33,5 @@ export interface Request extends RequestBase {
     refresh?: Refresh
   }
   /** @codegen_name privileges */
-  body?: Dictionary<string, Dictionary<string, Actions>>
+  body: Dictionary<string, Dictionary<string, Actions>>
 }