Added/updated snippets for docs (#2318)

docs/doc_examples/3a6238835c7d9f51e6d91f92885fadeb.asciidoc

@@ -0,0 +1,26 @@
+// 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: "my-index-000001",
+  mappings: {
+    properties: {
+      post_date: {
+        type: "date",
+      },
+      user: {
+        type: "keyword",
+      },
+      name: {
+        type: "keyword",
+      },
+      age: {
+        type: "integer",
+      },
+    },
+  },
+});
+console.log(response);
+----