We are using Elastic 1.7.6. As a company, we think it is better to upgrade Elastic 5.x. Anyway, we have been testing it for a week we hoped to see performance improvements but it performed worse. Search requests are responding slower. In addition, we didn't add any new configs we just transformed old ones to new ones.
3 nodes each
64 GB ram
80 gb ssd
total 3 shards 1 replicas.(we have 2 indexes)
My question is; is it normal or do we have wrong configs? I couldn't find any comparison with older versions.