Hello
Can I ask what packages you removed? and as for the error/s
WARN [Indices] Couldn't create index gl-failures_0. Error: No index template provider found for type 'failures'
ERROR [IndexRotationThread] Couldn't point deflector to a new index
java.lang.RuntimeException: Could not create new target index <gl-failures_0>.
Have you tried check the health, indices, etc… of elasticsearch using cURL?
check’s examples
Dangling indices
curl -X GET http://es_node:9200/_dangling?pretty
Check cluster with an explanation
curl -XGET http://es_node:9200/_cluster/allocation/explain?pretty
or
Check health
curl -XGET http://es_node:9200/_cluster/health?pretty=true
or
Elasticsearch’s cat shards API will tell you which shards are unassigned, and why:
curl -XGET http://es_node:9200/_cat/shards?h=index,shard,prirep,state,unassigned.reason| grep UNASSIGNED
From what I get in the logs Graylog is looking for the Index prefix: gl-failures