For me, a shotgun approach seemed the least likely to break.
Anything that is a dependency in the elastisearch index should trigger a job to export to it. And since it is idempotent it doesn't matter if it accidentally exports two or ten times the same index in a bg job. Just make sure before writing that you do a quick check that you're not overriding a fresher one. So just have a freshness timestamp which is the latest timestamp of any record used in the indexing data.
Furthermore you can do a daily job to just re export a critical part of the index. Doesn't matter if it is or isn't fresh. So let's say you query all records that were modified in the last day, and trigger the export job thatnmaynincludebthat record. Even if it causes duicate work. Idempotency saves you there.
Anything that is a dependency in the elastisearch index should trigger a job to export to it. And since it is idempotent it doesn't matter if it accidentally exports two or ten times the same index in a bg job. Just make sure before writing that you do a quick check that you're not overriding a fresher one. So just have a freshness timestamp which is the latest timestamp of any record used in the indexing data.
Furthermore you can do a daily job to just re export a critical part of the index. Doesn't matter if it is or isn't fresh. So let's say you query all records that were modified in the last day, and trigger the export job thatnmaynincludebthat record. Even if it causes duicate work. Idempotency saves you there.