Reading last year’s posts on LDTs seem to indicate that it was a work-in-progress/in beta. Is it still the case presently, or has it been upgraded to perhaps GA status?
My reason for this guess is that the release notes indicate frequent bug-fixing activity from 3.1.14 (Feb 25, 2014) up until 3.6.2 (Oct 9, 2015), and none afterwards. The only subsequent mention of LDT is in 18.104.22.168 regarding LDT scans; even then, it is a feature addition, not a bug fix.
It would be exciting if the LDT is regarded reliable enough for production use (even if it is a little slower than direct key queries), and it would be great to get an opinion from the Aerospike team.