Added/updated snippets for docs (#2318)

docs/doc_examples/ff1b96d2fdcf628bd938bff9e939943c.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: {
+      timestamp: {
+        type: "date",
+      },
+      temperature: {
+        type: "long",
+      },
+      voltage: {
+        type: "double",
+      },
+      node: {
+        type: "keyword",
+      },
+    },
+  },
+});
+console.log(response);
+----