Added new docs examples (#1233)

docs/doc_examples/ea02de2dbe05091fcb0dac72c8ba5f83.asciidoc

@@ -0,0 +1,18 @@
+// 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: 'twitter',
+  refresh: true,
+  slices: '5',
+  body: {
+    script: {
+      source: "ctx._source['extra'] = 'test'"
+    }
+  }
+})
+console.log(response)
+----
+