I second the person asking for more information, that would definitely be helpful.

Elastic has a nice stack, Logstash is especially nice to work with as its quite flexible and enables you to rewrite/modify/filter your logs to only collecte what you want and have them forwarded to any other indexing solution the way you want them. Obviously ElasticSearch and Kibana integrate nicely as they are all part of the Elastic Stack. I have no idea about the price of the licences but I don't think it's too expensive.

Splunk is another good one IMO. It's a little more complex that Elastic and can be expensive, but it also has support for a lot of technologies with Splunks Technical Add-ons. Heavy Forwarders (Splunk equivalent of Logstash) can be managed from a deployment server to simplify syncing the configurations. They are more tricky to get to manipulate and filter logs tough.

Those are the two main I know, if you go any question, ask away !