Kibana for viewing non logstash logs

Hi,

I have my log streamer mechanism already in place, which stream the logs to a centralized server.
Now i need a viewing and analytics tools.

Can i use kibana for that?
What i got from documentation is that it will work on logstash indexed logs. In a nutshell elastic stack only.

Can i customize it for my logs viewing, and host as a web service?

As long as the data is in Elasticsearch then you can use Kibana.
It doesn't have to come via Logstash.