Same way you handle redundancy in general. You'll need multiple clients listening, and some sort of consensus algorithm to get them back into sync when one rest

Same way you handle redundancy in general. You'll need multiple clients listening, and some sort of consensus algorithm to get them back into sync when one restarts. One simple way (which involves doing double work) would be to have 2 clients, both of which listen to postgres and push to elastic search. Each sync will happen twice, but the sync will only fail to occur if both go down.