I'm new to elasticsearch, so sorry if my question is trivial, but I don't know what should I do. I tried to delete a lot of old indices from ES (I have v5.0.1). I made it with queries like DELETE *2014. It seemed to be ok, but after a period of time, those indices started to come back with red status of health. I also have a lot of shards UNASSIGNED for those indices and in log file I receive a message, that the dangling index could not be imported because of index with the same UUID in the index tombstone. I don't understand what exactly is this tombstone and how can I clean my ES now? How to clean this tombstone and remove all those unassigned shards?
Thanks in advance for every hints.
Take a look at the article below:
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