If ES doesn't work for you, I recommend Vespa. https://github.com/vespa-engine/vespa https://github.com/vespa-engine/vespa Others have made other suggestions,

If ES doesn't work for you, I recommend Vespa. https://github.com/vespa-engine/vespa https://github.com/vespa-engine/vespa Others have made other suggestions, but Vespa has two unique features. First it is battle tested at a large scale, second it supports combining the keyword and vector scores in several ways. The latter is something that other hybrid systems don't do very well in my experience.