You shouldn't have to delete your .kibana index ever since this is where all your work in Kibana is saved. But it looks like the error you're hitting is in the task manager index.
Kibana creates some docs in the .kibana index when it first starts up. If you delete the .kibana index while Kibana is already running that causes problems. I'm not 100% sure on the .kibana_task_manager index.
If you're OK starting clean again you could do these steps;
- stop Kibana (ctrl+c is OK)
- delete the .kibana index and the .kibana_task_manager index (these are actually both aliases which point to the actual index, but I think you can delete them through the alias)
- start Kibana
After this, you should be able to stop Kibana (ctrl+c) and restart it.
Regards,
Lee
Please let us know if that doesn't work.