Added/updated snippets for docs (#2318)

docs/doc_examples/fe6a21b4a6b33cd6abc522947d6f3ea2.asciidoc

@@ -0,0 +1,29 @@
+// 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.indices.create({
+  index: "idx",
+  mappings: {
+    _source: {
+      mode: "synthetic",
+    },
+    properties: {
+      date: {
+        type: "date",
+      },
+    },
+  },
+});
+console.log(response);
+
+const response1 = await client.index({
+  index: "idx",
+  id: 1,
+  document: {
+    date: ["2015-01-01T12:10:30Z", "2014-01-01T12:10:30Z"],
+  },
+});
+console.log(response1);
+----