Added/updated snippets for docs (#2318)

docs/doc_examples/1e4b17b830ead15087ccd96151a5ebde.asciidoc

@@ -0,0 +1,25 @@
+// 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.search({
+  index: "my-index-000001",
+  size: 0,
+  runtime_mappings: {
+    message_and_context: {
+      type: "keyword",
+      script:
+        "\n        emit(doc['message.keyword'].value + ' ' + doc['context.keyword'].value)\n      ",
+    },
+  },
+  aggs: {
+    message_stats: {
+      string_stats: {
+        field: "message_and_context",
+      },
+    },
+  },
+});
+console.log(response);
+----