Rest assured App Search, along with the whole of Enterprise Search, is still under very active development. Perhaps you've seen the latest 7.10 release notes, alluding to "only" bug fixes under App Search? Note that the items under "Enterprise Search" apply to both App Search and Workplace Search. The team is actively working on some big items coming down the pipe. I'd recommend giving App Search a try with the free trial offering on Cloud!
Of course I went through all release notes but could not find one single improvement that would be of benefit to the end user.
Everything in the release notes is just maintenance related or some internal improvements a visitor of a site using App Search doesn't care about. Upgrading dependencies is not really a new feature. The competition is far ahead with bringing value to ecommerce searches. I can not see one new feature that was added since Swiftype was acquired.
But thank you for the information that it is under active development, will take another look in a few months.
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