Added/updated snippets for docs (#2318)

docs/doc_examples/15d4be58359542775f4aff88e6d8adb5.asciidoc

@@ -0,0 +1,22 @@
+// 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.ingest.simulate({
+  id: "my-pipeline",
+  docs: [
+    {
+      _source: {
+        "my-keyword-field": "FOO",
+      },
+    },
+    {
+      _source: {
+        "my-keyword-field": "BAR",
+      },
+    },
+  ],
+});
+console.log(response);
+----