I'm unsure about the scalability of the solution. We have ten people in our team, and out of those, four people actually work on it. They're mostly data engineers. I'm not sure if we plan to increase usage or not in the future.

It is a highly scalable solution. It is a distributed system that can scale infinitely, horizontally.

Everybody uses the system. Eighty percent of the users in the whole enterprise, from management to ground level staff, use it at different times of the week, and at different times of the year. We do not have plans to increase our usage at this point, as it is at a comfortable level.

With increased sharding, performance degrades. Merger, when present, is a bottle-neck. Peer-to-peer sync has issues in SolrCloud when index is incrementally updated.