Added/updated snippets for docs (#2318)

docs/doc_examples/44da736ce0e1587c1e7c45eee606ead7.asciidoc

@@ -0,0 +1,19 @@
+// 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.updateByQuery({
+  index: "my-index-000001",
+  script: {
+    source: "ctx._source.count++",
+    lang: "painless",
+  },
+  query: {
+    term: {
+      "user.id": "kimchy",
+    },
+  },
+});
+console.log(response);
+----