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I will ask QA team to look into this. Thanks for bringing this into our attention
By default this endpoint 'api/episerver/v2.0/search/content/' return max 100 records, not all. Commerce catalog has more than 100 records, that why you can see only Commerce content.
You can use endpoint {{url}}/api/episerver/v2.0/search/content?query=Start >> the Start page will be return. Or remove almost Commerce content, you will see the CMS content when run endpoint.
If I filter on a specific contenttype though, like a blog page, they aren't returned. And as I said, in the Find UI only commerce content is returned. And we have on the dev environment only 29 products, so the other items should be there methinks
In our Find Index we have regular content items and commerce items. Maybe I am mistaken, but 'api/episerver/v2.0/search/content/' should return all content items available in the index, right? But only the commerce items are returned. This is also the case in the UI, when I go to Configure and type something to preview the boosting effect I only get commerce items.