The username specified does not exist.

[tijones]

Randomly happens quite frequently usually a restart will fix it however now its broken completely and i cant login at all,

if i curl -XGET http://localhost:9200/_cat/shards

I notice this shard is not started

nagioslogserver 0 p UNASSIGNED
nagioslogserver 0 r UNASSIGNED


How to start? maybe this is why?

[jolson]

This is almost definitely why you can't login - user name information is stored in the 'nagioslogserver' indices. Are both the primary and replica shards unassigned?

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curl -s -XGET http://localhost:9200/_cat/shards | grep UNASS

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curl -XGET localhost:9200/_nodes/jvm?pretty

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free -m

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cat /etc/sysconfig/elasticsearch

Show me the output of the above commands. Based on what you've described, you might be low on memory or the index may be corrupt.