Added/updated snippets for docs (#2318)

docs/doc_examples/249bf48252c8cea47ef872541c8a884c.asciidoc

@@ -0,0 +1,44 @@
+// This file is autogenerated, DO NOT EDIT
+// Use `node scripts/generate-docs-examples.js` to generate the docs examples
+
+[source, js]
+----
+const response = await client.security.grantApiKey({
+  grant_type: "password",
+  username: "test_admin",
+  password: "x-pack-test-password",
+  api_key: {
+    name: "my-api-key",
+    expiration: "1d",
+    role_descriptors: {
+      "role-a": {
+        cluster: ["all"],
+        indices: [
+          {
+            names: ["index-a*"],
+            privileges: ["read"],
+          },
+        ],
+      },
+      "role-b": {
+        cluster: ["all"],
+        indices: [
+          {
+            names: ["index-b*"],
+            privileges: ["all"],
+          },
+        ],
+      },
+    },
+    metadata: {
+      application: "my-application",
+      environment: {
+        level: 1,
+        trusted: true,
+        tags: ["dev", "staging"],
+      },
+    },
+  },
+});
+console.log(response);
+----