Add transform API via overlay (#2755)

Makefile

@@ -60,7 +60,9 @@ dump-routes: ## Create a new schema with all generics expanded
 contrib: | generate license-check spec-format-fix transform-to-openapi filter-for-serverless ## Pre contribution target
 
 overlay-docs: ## Apply overlays to OpenAPI documents
-	@npx bump overlay "output/openapi/elasticsearch-serverless-openapi.json" "docs/overlays/elasticsearch-serverless-openapi-overlays.yaml" > "output/openapi/elasticsearch-serverless-openapi.new.json"
+	@npx bump overlay "output/openapi/elasticsearch-serverless-openapi.json" "docs/overlays/elasticsearch-serverless-openapi-overlays.yaml" > "output/openapi/elasticsearch-serverless-openapi.tmp.json"
+	@npx @redocly/cli bundle output/openapi/elasticsearch-serverless-openapi.tmp.json --ext json -o output/openapi/elasticsearch-serverless-openapi.examples.json
+	rm output/openapi/elasticsearch-serverless-openapi.tmp.json
 
 lint-docs: ## Lint the OpenAPI documents
 	@npx @stoplight/spectral-cli lint output/openapi/*.json --ruleset .spectral.yaml

docs/overlays/elasticsearch-serverless-openapi-overlays.yaml

@@ -11,5 +11,23 @@ actions:
         **Technical preview**  
         This functionality is in technical preview and may be changed or removed in a future release.
         Elastic will work to fix any issues, but features in technical preview are not subject to the support SLA of official GA features.
-
+  - target: "$.paths['/_transform/{transform_id}']['put']"
+    description: "Update create transform operation"
+    update: 
+      requestBody: 
+        content: 
+          application/json: 
+            examples: 
+              createTransformRequestExample1: 
+                $ref: "../../specification/transform/put_transform/examples/request/PutTransformRequestExample1.json"
+              createTransformRequestExample2:
+                $ref: "../../specification/transform/put_transform/examples/request/PutTransformRequestExample2.json"
+      responses:
+        200:
+          content:
+            application/json:
+              examples:
+                createTransformResponseExample1:
+                  $ref: "../../specification/transform/put_transform/examples/200_response/PutTransformResponseExample1.json"
+