The solution is stable.

I did experience a few lags. So we had to reset the servers and all other stuff because sometimes Elasticsearch is not responding properly. So, during that time, we just restarted the services. Probably, some kinds of metrics do not match the current requirements. That could be the reason.

I would rate the stability an eight out of ten. 

It provides a high level of stability.

The stability of this product is good. We are always informed whenever the server is down.