Hi @stark
Thank you for the question!
I think you know how to deal with PODS custom meta fields because I see that you have created clusters with data in the index, and I think it was achieved by the custom code. That's 80% of the job!
As I can see your post records are searchable in the Sandbox by words from the "0" cluster (the custom metafield).
The only problem is you can not get your custom posts shown in the search results on the front page.
This may be caused by a hook in your theme or custom code that intercepts pre_get_posts or another hook related to WP_Query and adds additional filtering to posts either at the input parameter level (for example, it allows searching only posts with post_type = post, page; or adds additional WHERE conditions directly to the query that is formed in WP_Query). I would advise you to review the code of your custom plugins and theme for such hooks. I also recommended that you disable all plugins that may be related to search for testing. For example, Elastic Press.
We are not very familiar with the functionality of PODS, it is obviously similar to the ACF plugin in the database, but it probably also adds some conditions to the search.
The presence of a conflicting hook may also be indicated by the fact that in analytics all queries show either 0 or -1 results, which is incorrect information.
By the way, could you click on any of the rows in the analytics table and see the query details? That might give us a clue as to why this is happening.
Also, give me some time - I need to see if The7 theme conflicts with WPFTS.
Thanks! Let me know if any of the above tips helped you.