How do I index custom fields with the search API using elasticsearch? I see all kinds of tutorials to get apache to index content.  Is there any difference in getting elasticsearch to index my new custom field?

On the field page I can see my field but when i expand it there is nothing to add.

Using this Create custom fields using custom Processors in Drupal 8 tutorial, but it doesn't seem to be working and no errors are being thrown so I don't know if my code is broken or this is apache specific.
You seems to have provided link for creating custom fields using processor. Processor works smoothly for me.

Create custom fields using processor.
Make sure your name spaces are done correctly.
Enable your processor from the processor tab of Elasticsearch ui in Backend.
Go to &quot;fields&quot; section. You will see your added field there.
Finally Index item.