Added/updated snippets for docs (#2318)

docs/doc_examples/d7919fb6f4d02dde1390775eb8365b79.asciidoc

@@ -0,0 +1,16 @@
+// 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.putMapping({
+  index: "my-index-000001",
+  properties: {
+    my_field: {
+      type: "text",
+      fielddata: true,
+    },
+  },
+});
+console.log(response);
+----