I just had a try about the index settings: blocks.read_only, but it does not work.
After I have set it to true by running curl -XPUT, I still can delete index pattern from from "manage" in kibana.
I also tried to set blocks.write and blocks.metadata to true, and they all do not work.
I noticed that the index is not physically deleted from elasticsearch (by checking disk) even though the index
pattern has been removed in Kibana. What I actually want to achieve is that all settings/configurations on
Kibana web interface cannot be modified or removed (at least index pattern cannot be deleted, and possible dashboards, etc).
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