Elasticsearch stopped and can't start again

Elastic Stack Elasticsearch
1

Here is log:

Apr 28 08:07:19 scw-fcc8a8 elasticsearch[3388]: 2020-04-28 08:07:18,907 main ERROR Null object returned for RollingFile in Appenders.
Apr 28 08:07:19 scw-fcc8a8 elasticsearch[3388]: 2020-04-28 08:07:18,907 main ERROR Null object returned for RollingFile in Appenders.
Apr 28 08:07:19 scw-fcc8a8 elasticsearch[3388]: 2020-04-28 08:07:18,908 main ERROR Null object returned for RollingFile in Appenders.
Apr 28 08:07:19 scw-fcc8a8 elasticsearch[3388]: 2020-04-28 08:07:18,908 main ERROR Unable to locate appender "rolling" for logger config "root"
Apr 28 08:07:19 scw-fcc8a8 elasticsearch[3388]: 2020-04-28 08:07:18,909 main ERROR Unable to locate appender "index_indexing_slowlog_rolling" for logger config "index.indexing.slowlog.index"
Apr 28 08:07:19 scw-fcc8a8 elasticsearch[3388]: 2020-04-28 08:07:18,909 main ERROR Unable to locate appender "index_search_slowlog_rolling" for logger config "index.search.slowlog"
Apr 28 08:07:19 scw-fcc8a8 elasticsearch[3388]: 2020-04-28 08:07:18,909 main ERROR Unable to locate appender "deprecation_rolling" for logger config "org.elasticsearch.deprecation"
Apr 28 08:07:19 scw-fcc8a8 systemd[1]: elasticsearch.service: Main process exited, code=exited, status=1/FAILURE
Apr 28 08:07:19 scw-fcc8a8 systemd[1]: elasticsearch.service: Unit entered failed state.
Apr 28 08:07:19 scw-fcc8a8 systemd[1]: elasticsearch.service: Failed with result 'exit-code'.

It is a single node 8GB RAM, 4GB heap size.
Before it is stopped it had a 90 indices, 3 shards each. So it can be too much. How can I recover it?

2

Could you share elasticsearch logs?

With 4gb of HEAP, I'd not put more than 80 shards. Here you have 270 shards which is probably too much.

3

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