I am very interested in hearing about your experiences migrating to vespa. When it was opensourced we all thought it would be an absolute game-changer, but I see so few people building new products (or migrating existing products to) vespa.
We do at Vimeo: I gave a talk this week at the NY Elasticsearch meetup about a new search product we built using ES.
If you're interested you can access the recording of the livestream here: https://vimeo.com/348443979
The product in question is https://vimeo.com/stock
Fair points, but I think it's important to highlight the distinction between Elasticsearch BV, (the company - who will try to continue to offer commercial services and support to grow their business - fair enough) and the Elasticsearch project, which is the open source project.
As a company, Elasticsearch BV will reinvest back into the Elasticsearch project, which will increase the adoption and value of their commercial services. Both exist independently, but the success of either improves the other.
I've been really impressed with how easy it was to set up and instantly identify bottlenecks within our infrastructure. Sure, other plugins have offered similar statistics (and some with a nice UI too) but to provide all of this insight out-of-the-box and in a single tool is an amazing addition to Elasticsearch, and in my opinion will help boost even more widespread adoption.