Part of the issue is lack of visibility into what is going on, you don't get a lot of ability to debug. Company I was at switched from AWS's ElasticSearch to h

Part of the issue is lack of visibility into what is going on, you don't get a lot of ability to debug. Company I was at switched from AWS's ElasticSearch to hosting it ourselves on top of EC2 instances so that we could control the memory/CPU/disks and see logging/understand more about the internals to help understand why it was slow for our use case.