Support subobjects: auto (#3877) (#3878)

(cherry picked from commit a88eef2)

Co-authored-by: Quentin Pradet <[email protected]>

Author: github-actions[bot]

output/openapi/elasticsearch-openapi.json

@@ -48,7 +48,7 @@ export class TypeMapping {
   _source?: SourceField
   runtime?: Dictionary<string, RuntimeField>
   enabled?: boolean
-  subobjects?: boolean
+  subobjects?: Subobjects
   /**
    * @availability stack since=7.16.0
    * @availability serverless
@@ -59,3 +59,16 @@ export class TypeMapping {
 export class DataStreamTimestamp {
   enabled: boolean
 }
+
+/**
+ * @es_quirk This enum is a boolean that evolved into a tri-state enum. True and False have
+ *   to be (de)serialized as JSON booleans.
+ */
+export enum Subobjects {
+  true,
+  false,
+  /**
+   * @availability stack since=8.16.0 visibility=feature_flag feature_flag=sub_objects_auto
+   */
+  auto
+}

output/openapi/elasticsearch-serverless-openapi.json

@@ -21,6 +21,7 @@ import { TimeSeriesMetricType } from '@_types/mapping/TimeSeriesMetricType'
 import { double, integer } from '@_types/Numeric'
 import { CorePropertyBase, IndexOptions } from './core'
 import { PropertyBase } from './Property'
+import { Subobjects } from './TypeMapping'
 
 export class FlattenedProperty extends PropertyBase {
   boost?: double
@@ -44,7 +45,7 @@ export class NestedProperty extends CorePropertyBase {
 
 export class ObjectProperty extends CorePropertyBase {
   enabled?: boolean
-  subobjects?: boolean
+  subobjects?: Subobjects
   type?: 'object'
 }