how to properly delete index, eg. winlogbeat-2016.06.30 on Windows ELK?
We offer a REST api  which is accessible from many clients.
- The simplest (in Unix) is using the CURL command-line tool which I'm sure you can find Windows-equivalents of.
- Language clients like Python, Perl, Java, Ruby etc
- Browser-based GUIs
- General-purpose REST clients 
- elasticsearch-specific UIs 
Thank you, link  is interesting, ElasticHQ looks good.
As a bonus, there is a Windows binary package available.
I looked at curator but it is a little bit complicated tool as for me, but I try to learn it, thanks for help.
I try to use
Windows curator but I have troubles, I'd like to delete indices ex. from
winlogbeat-2016.07.30, how can I do this?
I noticed something and it is a little bit strange, when I delete index with ElasticHQ and then add other machine to send events, the deleted index is re-created, although is small. How can I permanently delete it?
If it is being recreated, it is because something is still being sent to be indexed to that index. You will simply have to re-delete it until nothing else is sending data.
As far as using Curator is concerned, try the delete_indices example as a starting place.