Add GET _inference

Author: davidkyle

output/openapi/elasticsearch-serverless-openapi.json

@@ -11,6 +11,10 @@
     },
     "url": {
       "paths": [
+        {
+          "path": "/_inference",
+          "methods": ["GET"]
+        },
         {
           "path": "/_inference/{inference_id}",
           "methods": ["GET"],

output/schema/schema.json

@@ -36,6 +36,6 @@ export interface Request extends RequestBase {
     /**
      * The inference Id
      */
-    inference_id: Id
+    inference_id?: Id
   }
 }