I have created my graylog server with 2 elasticsearch nodes and work the system perfectly more than 10 months.
But 3 days back, in indices section of the graylog server it is showing that " Elasticsearch cluster is yellow"
When I check both elasticsearch nodes are working
There are total 2344 shards available and but only 1174 are active and 1174 are unassigned.
Why this kind of an incident happens ?