What are you looking for? Come on! It is ELK

We are living in world of data.  Big data, small data, any data is coming from every place.  What is important is to get from this data information.
What I found nice is ELK. You know it or not, don't worry, sooner or later you will find use case for that. Especially if you are working with any data-producing system you want to use this data, don't you?  One of this use cases can be log information extraction.
It is good to write logs.  This can help you to be up-to-date with your application life, hear it's heart beating, listen to it's sad and funny stories. This is where ELK come with the rescue.
You may find many information how to run it but I will shortly say that is stack based on Elastic(search) based on Lucene. Logstash processes data and Kibana can nicely present it. Lucene is impressive. With Elastic you can look for data smartly, you feel that Lucene engine understands you because it can not only do passive comparison like

 text equals "string" 

but it was created to give you chance to check if

 text is similar to "string" 

. That's only top of iceberg but if you have never worked that try it. In my previous company we have started it against logs and it fastened access to log information. But that's not only one usecase. Sky is the limit.