Transferring Data From Firebase To Elasticsearch

I need to get data from a Firebase database into Elasticsearch. I've considered using Firebase cloud functions, Flashlight and Google Pub/Sub. The big issue that I see with cloud functions and flashlight is reliability. If the write to elasticsearch fails due to a network outage, the service is down, etc. there isn't a way to retry the write and neither solution is persistent. Google Pub/Sub is persistent and can retry the write, but I'm concerned about message ordering. I can probably implement timestamp checking as a solution, but I feel like I'm reinventing the wheel.

Any chance any of you have tackled something like this before and can give me some suggestions on the best way to proceed?



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