ElasticSearch-5.4.3 启动时没有生成log，通过 systemctl status elasticsearch
查看到以下信息：Null object returned for RollingFile in Appenders
[root@elasticsearch03 log]# systemctl status elasticsearch
● elasticsearch.service - Elasticsearch
Loaded: loaded (/usr/lib/systemd/system/elasticsearch.service; enabled; vendor preset: disabled)
Active: failed (Result: exit-code) since 四 2021-05-27 17:42:58 CST; 7s ago
Docs: http://www.elastic.co
Process: 17722 ExecStart=/usr/share/elasticsearch/bin/elasticsearch -p ${PID_DIR}/elasticsearch.pid --quiet -Edefault.path.logs=${LOG_DIR} -Edefault.path.data=${DATA_DIR} -Edefault.path.conf=${CONF_DIR} (code=exited, status=1/FAILURE)
Process: 17720 ExecStartPre=/usr/share/elasticsearch/bin/elasticsearch-systemd-pre-exec (code=exited, status=0/SUCCESS)
Main PID: 17722 (code=exited, status=1/FAILURE)
5月 27 17:42:58 elasticsearch03 elasticsearch[17722]: 2021-05-27 17:42:57,993 main ERROR Null object returned for RollingFile in Appenders.
5月 27 17:42:58 elasticsearch03 elasticsearch[17722]: 2021-05-27 17:42:57,993 main ERROR Null object returned for RollingFile in Appenders.
5月 27 17:42:58 elasticsearch03 elasticsearch[17722]: 2021-05-27 17:42:57,993 main ERROR Unable to locate appender "rolling" for logger config "root"
5月 27 17:42:58 elasticsearch03 elasticsearch[17722]: 2021-05-27 17:42:57,994 main ERROR Unable to locate appender "index_indexing_slowlog_rolling" for logger config "index.indexing.slowlog.index"
5月 27 17:42:58 elasticsearch03 elasticsearch[17722]: 2021-05-27 17:42:57,994 main ERROR Unable to locate appender "audit_rolling" for logger config "org.elasticsearch.xpack.security.audit.log...ngAuditTrail"
5月 27 17:42:58 elasticsearch03 elasticsearch[17722]: 2021-05-27 17:42:57,994 main ERROR Unable to locate appender "index_search_slowlog_rolling" for logger config "index.search.slowlog"
5月 27 17:42:58 elasticsearch03 elasticsearch[17722]: 2021-05-27 17:42:57,994 main ERROR Unable to locate appender "deprecation_rolling" for logger config "org.elasticsearch.deprecation"
5月 27 17:42:58 elasticsearch03 systemd[1]: elasticsearch.service: main process exited, code=exited, status=1/FAILURE
5月 27 17:42:58 elasticsearch03 systemd[1]: Unit elasticsearch.service entered failed state.
5月 27 17:42:58 elasticsearch03 systemd[1]: elasticsearch.service failed.
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通过网上查询的方法修改 log4j2.properties 文件里的 logger.deprecation.level 从warn改为error，重新启动问题依旧，错误信息也没改变
