Kibana - How to display log as table

On the Discover tab, create a view that has just the fields you want and then save that as a search.

On the Dashboard tab, click on Edit then hit the + Create new button to add a widget, but if you look at the top, there's a Searches tab. Select that and add your saved search in.

[Elastic 7.x / 2019 Update]

I was a bit confused when I read @Alcanzar's answer so I am sharing a little more noob-friendly step-by-step how-to here :

• STEP 1 : Create the Index Pattern

• STEP 2 : Go to the Dashboard view, and create a view on your index
  Select each column you want to include/add in your view by clicking "add" on it (The confusing part is that until you do that, you will have a "scrambled" view listing everything in a jumbled way.)

• STEP 3 : Go to the Dashboard view, and create a view on your index

The trick is to select the specific columns you want to include... and voila !
Don't forget to save your view, this will help a lot in the process.

In Kibana 7.5.0 you can do it as follows:

1. Go to Discover section
2. Select fields you are interested in
3. Click on Save to save your discover search so you can use it in visualizations and dashboards
4. Click on Dashboard and create a new dashboard
5. Click on Add and select the panel
6. There is no step 6