Added/updated snippets for docs (#2318)

docs/doc_examples/ab1372270c11bcd6f36d1a13e6c69276.asciidoc

@@ -0,0 +1,18 @@
+// 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.asyncSearch.submit({
+  index:
+    "my-index-000001,cluster_one:my-index-000001,cluster_two:my-index-000001",
+  ccs_minimize_roundtrips: "true",
+  query: {
+    match: {
+      "user.id": "kimchy",
+    },
+  },
+  _source: ["user.id", "message", "http.response.status_code"],
+});
+console.log(response);
+----