Added/updated snippets for docs (#2318)

docs/doc_examples/eeb35b759bd239bb773c8ebd5fe63d05.asciidoc

@@ -0,0 +1,25 @@
+// 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.search({
+  index: "museums",
+  size: 0,
+  aggs: {
+    cities: {
+      terms: {
+        field: "city.keyword",
+      },
+      aggs: {
+        centroid: {
+          geo_centroid: {
+            field: "location",
+          },
+        },
+      },
+    },
+  },
+});
+console.log(response);
+----