Add more options to index management -> indices screen

[sandervandegeijn]

Is your feature request related to a problem? Please describe.
Deleting an index, updating it's settings, etc. would be nice to have here like Kibana from ElasticSearch itself.

Describe the solution you'd like
A clear and concise description of what you want to happen.

Describe alternatives you've considered
REST API is fine but a graphical interface would be nice as well.

Additional context
Add any other context or screenshots about the feature request here.

[dswitzer]

The ability to do some simple management options like "Delete" is sorely missing from this plugin.