Cloud Datastore: How to exclude properties from being indexed in node.js?

When using the Node.js client how do we exclude all the properties from being indexed? I can’t find any documentation. I saw this but unable to decode it into a working example. can anyone show with an example please?

As shown in this comment in GitHub:

regarding “.*”, “.” is representing root path here and * representing everything from there!

You should be able to use the wildcard .* to exclude all elements from being indexed.