I have installed Elasticsearch on an Ubuntu 22.04 system. When I start the service, I get a warning message like the following in the Elasticsearch log:
[2023-04-03T14:07:41,411][WARN ][stderr ] [<<hostname>>] Apr 03, 2023 2:07:41 PM org.apache.lucene.store.MemorySegmentIndexInputProvider <init>
This message is meaningless. I have tried searching for it, to no avail. Can anyone shed any light on its meaning?
Welcome to our community! 
Can you share more of the log please?
Thanks Mark. An extract from the log file is attached, showing the warning message in context.
(Attachment elasticsearch_log is missing)
Thanks Mark. An extract from the log file is pasted below, showing the warning message in context. (Your system rejected this as an attachment.)
[2023-04-03T12:50:52,885[INFO ][o.e.n.Node ] [<<hostname>>] version[8.7.0], pid[151581], build[deb/09520b59b6bc1057340b55750186466ea715e30e/2023-03-27T16:31:09.816451435Z], OS[Linux/5.15.0-69-generic/amd64], JVM[Oracle Corporation/OpenJDK 64-Bit Server VM/19.0.2/19.0.2+7-44]
[2023-04-03T12:50:52,896][INFO ][o.e.n.Node ] [<<hostname>>] JVM home [/usr/share/elasticsearch/jdk], using bundled JDK [true]
[2023-04-03T12:50:52,897][INFO ][o.e.n.Node ] [<<hostname>>] JVM arguments [-Des.networkaddress.cache.ttl=60, -Des.networkaddress.cache.negative.ttl=10, -Djava.security.manager=allow, -XX:+AlwaysPreTouch, -Xss1m, -Djava.awt.headless=true, -Dfile.encoding=UTF-8, -Djna.nosys=true, -XX:-OmitStackTraceInFastThrow, -Dio.netty.noUnsafe=true, -Dio.netty.noKeySetOptimization=true, -Dio.netty.recycler.maxCapacityPerThread=0, -Dlog4j.shutdownHookEnabled=false, -Dlog4j2.disable.jmx=true, -Dlog4j2.formatMsgNoLookups=true, -Djava.locale.providers=SPI,COMPAT, --add-opens=java.base/java.io=ALL-UNNAMED, -XX:+UseG1GC, -Djava.io.tmpdir=/var/tmpexec, -XX:+HeapDumpOnOutOfMemoryError, -XX:+ExitOnOutOfMemoryError, -XX:HeapDumpPath=/var/lib/elasticsearch, -XX:ErrorFile=/var/log/elasticsearch/hs_err_pid%p.log, -Xlog:gc*,gc+age=trace,safepoint:file=/var/log/elasticsearch/gc.log:utctime,level,pid,tags:filecount=32,filesize=64m, -Des.enforce.bootstrap.checks=true, -Xms1473m, -Xmx1473m, -XX:MaxDirectMemorySize=772800512, -XX:G1HeapRegionSize=4m, -XX:InitiatingHeapOccupancyPercent=30, -XX:G1ReservePercent=15, -Des.distribution.type=deb, --module-path=/usr/share/elasticsearch/lib, --add-modules=jdk.net, -Djdk.module.main=org.elasticsearch.server]
[2023-04-03T12:50:55,433][INFO ][c.a.c.i.j.JacksonVersion ] [<<hostname>>] Package versions: jackson-core=2.13.4, jackson-databind=2.13.4-2, jackson-dataformat-xml=2.13.4, jackson-datatype-jsr310=2.13.4, azure-core=1.34.0, Troubleshooting version conflicts: [https://aka.ms/azsdk/java/dependency/troubleshoot](https://aka.ms/azsdk/java/dependency/troubleshoot)
[2023-04-03T12:50:57,179][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [aggregations]
[2023-04-03T12:50:57,180][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [analysis-common]
[2023-04-03T12:50:57,180][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [apm]
[2023-04-03T12:50:57,180][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [blob-cache]
[2023-04-03T12:50:57,181][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [constant-keyword]
[2023-04-03T12:50:57,181][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [data-streams]
[2023-04-03T12:50:57,181][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [frozen-indices]
[2023-04-03T12:50:57,181][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [ingest-attachment]
[2023-04-03T12:50:57,181][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [ingest-common]
[2023-04-03T12:50:57,182][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [ingest-geoip]
[2023-04-03T12:50:57,182][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [ingest-user-agent]
[2023-04-03T12:50:57,183][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [kibana]
[2023-04-03T12:50:57,183][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [lang-expression]
[2023-04-03T12:50:57,183][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [lang-mustache]
[2023-04-03T12:50:57,183][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [lang-painless]
[2023-04-03T12:50:57,183][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [legacy-geo]
[2023-04-03T12:50:57,183][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [mapper-extras]
[2023-04-03T12:50:57,184][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [mapper-version]
[2023-04-03T12:50:57,184][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [old-lucene-versions]
[2023-04-03T12:50:57,184][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [parent-join]
[2023-04-03T12:50:57,184][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [percolator]
[2023-04-03T12:50:57,184][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [rank-eval]
[2023-04-03T12:50:57,185][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [reindex]
[2023-04-03T12:50:57,185][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [repositories-metering-api]
[2023-04-03T12:50:57,185][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [repository-azure]
[2023-04-03T12:50:57,185][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [repository-gcs]
[2023-04-03T12:50:57,185][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [repository-s3]
[2023-04-03T12:50:57,186][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [repository-url]
[2023-04-03T12:50:57,186][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [runtime-fields-common]
[2023-04-03T12:50:57,186][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [search-business-rules]
[2023-04-03T12:50:57,187][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [searchable-snapshots]
[2023-04-03T12:50:57,187][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [snapshot-based-recoveries]
[2023-04-03T12:50:57,187][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [snapshot-repo-test-kit]
[2023-04-03T12:50:57,187][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [spatial]
[2023-04-03T12:50:57,188][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [systemd]
[2023-04-03T12:50:57,188][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [transform]
[2023-04-03T12:50:57,188][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [transport-netty4]
[2023-04-03T12:50:57,188][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [unsigned-long]
[2023-04-03T12:50:57,188][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [vector-tile]
[2023-04-03T12:50:57,189][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [wildcard]
[2023-04-03T12:50:57,189][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [x-pack-aggregate-metric]
[2023-04-03T12:50:57,189][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [x-pack-analytics]
[2023-04-03T12:50:57,190][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [x-pack-async]
[2023-04-03T12:50:57,190][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [x-pack-async-search]
[2023-04-03T12:50:57,191][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [x-pack-autoscaling]
[2023-04-03T12:50:57,191][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [x-pack-ccr]
[2023-04-03T12:50:57,191][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [x-pack-core]
[2023-04-03T12:50:57,191][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [x-pack-deprecation]
[2023-04-03T12:50:57,191][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [x-pack-enrich]
[2023-04-03T12:50:57,192][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [x-pack-eql]
[2023-04-03T12:50:57,192][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [x-pack-fleet]
[2023-04-03T12:50:57,192][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [x-pack-graph]
[2023-04-03T12:50:57,193][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [x-pack-identity-provider]
[2023-04-03T12:50:57,193][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [x-pack-ilm]
[2023-04-03T12:50:57,193][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [x-pack-logstash]
[2023-04-03T12:50:57,194][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [x-pack-ml]
[2023-04-03T12:50:57,195][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [x-pack-monitoring]
[2023-04-03T12:50:57,195][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [x-pack-profiling]
[2023-04-03T12:50:57,196][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [x-pack-ql]
[2023-04-03T12:50:57,196][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [x-pack-rollup]
[2023-04-03T12:50:57,198][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [x-pack-security]
[2023-04-03T12:50:57,199][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [x-pack-shutdown]
[2023-04-03T12:50:57,199][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [x-pack-sql]
[2023-04-03T12:50:57,199][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [x-pack-stack]
[2023-04-03T12:50:57,199][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [x-pack-text-structure]
[2023-04-03T12:50:57,199][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [x-pack-voting-only-node]
[2023-04-03T12:50:57,199][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [x-pack-watcher]
[2023-04-03T12:50:57,199][INFO ][o.e.p.PluginsService ] [<<hostname>>] loaded module [x-pack-write-load-forecaster]
[2023-04-03T12:50:57,199][INFO ][o.e.p.PluginsService ] [<<hostname>>] no plugins loaded
[2023-04-03T12:51:00,208][WARN ][stderr ] [<<hostname>>] Apr 03, 2023 12:51:00 PM org.apache.lucene.store.MemorySegmentIndexInputProvider <init>
[2023-04-03T12:51:00,221][INFO ][o.e.e.NodeEnvironment ] [<<hostname>>] using [1] data paths, mounts [[/var/lib/elasticsearch (/dev/mapper/vg0-var_lib_elasticsearch)]], net usable_space [49.5gb], net total_space [49.9gb], types [xfs]
[2023-04-03T12:51:00,222][INFO ][o.e.e.NodeEnvironment ] [<<hostname>>] heap size [1.4gb], compressed ordinary object pointers [true]
[2023-04-03T12:51:00,294][INFO ][o.e.n.Node ] [<<hostname>>] node name [<<hostname>>], node ID [shddce8aRmO1wQDsSpNjFg], cluster name [elasticsearch], roles [data_frozen, ingest, data_cold, data, remote_cluster_client, master, data_warm, data_content, transform, data_hot, ml]
[2023-04-03T12:51:03,076][INFO ][o.e.x.m.p.l.CppLogMessageHandler] [<<hostname>>] [controller/151602] [Main.cc@123] controller (64 bit): Version 8.7.0 (Build e4e1c23721e58c) Copyright (c) 2023 Elasticsearch BV
[2023-04-03T12:51:03,354][INFO ][o.e.x.s.Security ] [<<hostname>>] Security is enabled
[2023-04-03T12:51:04,039][INFO ][o.e.x.s.a.s.FileRolesStore] [<<hostname>>] parsed [0] roles from file [/etc/elasticsearch/roles.yml]
[2023-04-03T12:51:04,385][INFO ][o.e.x.s.InitialNodeSecurityAutoConfiguration] [<<hostname>>] Auto-configuration will not generate a password for the elastic built-in superuser, as we cannot determine if there is a terminal attached to the elasticsearch process. You can use the `bin/elasticsearch-reset-password` tool to set the password for the elastic user.
[2023-04-03T12:51:04,759][INFO ][o.e.x.p.ProfilingPlugin ] [<<hostname>>] Profiling is enabled
[2023-04-03T12:51:04,760][INFO ][o.e.i.g.DatabaseNodeService] [<<hostname>>] deleting stale file [/var/tmpexec/geoip-databases/shddce8aRmO1wQDsSpNjFg/GeoLite2-Country.mmdb]
[2023-04-03T12:51:04,761][INFO ][o.e.i.g.DatabaseNodeService] [<<hostname>>] deleting stale file [/var/tmpexec/geoip-databases/shddce8aRmO1wQDsSpNjFg/GeoLite2-ASN.mmdb]
[2023-04-03T12:51:04,761][INFO ][o.e.i.g.DatabaseNodeService] [<<hostname>>] deleting stale file [/var/tmpexec/geoip-databases/shddce8aRmO1wQDsSpNjFg/GeoLite2-City.mmdb]
[2023-04-03T12:51:04,764][INFO ][o.e.i.g.DatabaseNodeService] [<<hostname>>] deleting stale file [/var/tmpexec/geoip-databases/shddce8aRmO1wQDsSpNjFg/GeoLite2-ASN.mmdb_COPYRIGHT.txt]
[2023-04-03T12:51:04,765][INFO ][o.e.i.g.DatabaseNodeService] [<<hostname>>] deleting stale file [/var/tmpexec/geoip-databases/shddce8aRmO1wQDsSpNjFg/GeoLite2-ASN.mmdb_LICENSE.txt]
[2023-04-03T12:51:04,765][INFO ][o.e.i.g.DatabaseNodeService] [<<hostname>>] deleting stale file [/var/tmpexec/geoip-databases/shddce8aRmO1wQDsSpNjFg/GeoLite2-ASN.mmdb_elastic-geoip-database-service-agreement-LICENSE.txt]
[2023-04-03T12:51:04,765][INFO ][o.e.i.g.DatabaseNodeService] [<<hostname>>] deleting stale file [/var/tmpexec/geoip-databases/shddce8aRmO1wQDsSpNjFg/GeoLite2-Country.mmdb_COPYRIGHT.txt]
[2023-04-03T12:51:04,765][INFO ][o.e.i.g.DatabaseNodeService] [<<hostname>>] deleting stale file [/var/tmpexec/geoip-databases/shddce8aRmO1wQDsSpNjFg/GeoLite2-Country.mmdb_LICENSE.txt]
[2023-04-03T12:51:04,765][INFO ][o.e.i.g.DatabaseNodeService] [<<hostname>>] deleting stale file [/var/tmpexec/geoip-databases/shddce8aRmO1wQDsSpNjFg/GeoLite2-Country.mmdb_elastic-geoip-database-service-agreement-LICENSE.txt]
[2023-04-03T12:51:04,766][INFO ][o.e.i.g.DatabaseNodeService] [<<hostname>>] deleting stale file [/var/tmpexec/geoip-databases/shddce8aRmO1wQDsSpNjFg/GeoLite2-City.mmdb_README.txt]
[2023-04-03T12:51:04,766][INFO ][o.e.i.g.DatabaseNodeService] [<<hostname>>] deleting stale file [/var/tmpexec/geoip-databases/shddce8aRmO1wQDsSpNjFg/GeoLite2-City.mmdb_COPYRIGHT.txt]
[2023-04-03T12:51:04,766][INFO ][o.e.i.g.DatabaseNodeService] [<<hostname>>] deleting stale file [/var/tmpexec/geoip-databases/shddce8aRmO1wQDsSpNjFg/GeoLite2-City.mmdb_LICENSE.txt]
[2023-04-03T12:51:04,766][INFO ][o.e.i.g.DatabaseNodeService] [<<hostname>>] deleting stale file [/var/tmpexec/geoip-databases/shddce8aRmO1wQDsSpNjFg/GeoLite2-City.mmdb_elastic-geoip-database-service-agreement-LICENSE.txt]
[2023-04-03T12:51:05,497][INFO ][o.e.t.n.NettyAllocator ] [<<hostname>>] creating NettyAllocator with the following configs: [name=elasticsearch_configured, chunk_size=1mb, suggested_max_allocation_size=1mb, factors={es.unsafe.use_netty_default_chunk_and_page_size=false, g1gc_enabled=true, g1gc_region_size=4mb}]
[2023-04-03T12:51:05,524][INFO ][o.e.i.r.RecoverySettings ] [<<hostname>>] using rate limit [40mb] with [default=40mb, read=0b, write=0b, max=0b]
[2023-04-03T12:51:05,570][INFO ][o.e.d.DiscoveryModule ] [<<hostname>>] using discovery type [multi-node] and seed hosts providers [settings]
[2023-04-03T12:51:07,019][INFO ][o.e.n.Node ] [<<hostname>>] initialized
[2023-04-03T12:51:07,020][INFO ][o.e.n.Node ] [<<hostname>>] starting ...
[2023-04-03T12:51:07,035][INFO ][o.e.x.s.c.f.PersistentCache] [<<hostname>>] persistent cache index loaded
[2023-04-03T12:51:07,035][INFO ][o.e.x.d.l.DeprecationIndexingComponent] [<<hostname>>] deprecation component started
[2023-04-03T12:51:07,137][INFO ][o.e.t.TransportService ] [<<hostname>>] publish_address {127.0.0.1:9300}, bound_addresses {127.0.0.1:9300}
[2023-04-03T12:51:07,436][INFO ][o.e.b.BootstrapChecks ] [<<hostname>>] explicitly enforcing bootstrap checks
[2023-04-03T12:51:07,456][WARN ][o.e.c.c.ClusterBootstrapService] [<<hostname>>] this node is locked into cluster UUID [Lm1iS8scRjaTTfcDjst03A] but [cluster.initial_master_nodes] is set to [<<hostname>>]; remove this setting to avoid possible data loss caused by subsequent cluster bootstrap attempts; for further information see [https://www.elastic.co/guide/en/elasticsearch/reference/8.7/important-settings.html#initial_master_nodes](https://www.elastic.co/guide/en/elasticsearch/reference/8.7/important-settings.html#initial_master_nodes)
[2023-04-03T12:51:07,571][INFO ][o.e.c.s.MasterService ] [<<hostname>>] elected-as-master ([1] nodes joined)[_FINISH_ELECTION_, {<<hostname>>}{shddce8aRmO1wQDsSpNjFg}{khcwSnx1QvCdkEb0O1Gfaw}{<<hostname>>}{127.0.0.1}{127.0.0.1:9300}{cdfhilmrstw}{8.7.0} completing election], term: 6, version: 66, delta: master node changed {previous [], current [{<<hostname>>}{shddce8aRmO1wQDsSpNjFg}{khcwSnx1QvCdkEb0O1Gfaw}{<<hostname>>}{127.0.0.1}{127.0.0.1:9300}{cdfhilmrstw}{8.7.0}]}
[2023-04-03T12:51:07,633][INFO ][o.e.c.s.ClusterApplierService] [<<hostname>>] master node changed {previous [], current [{<<hostname>>}{shddce8aRmO1wQDsSpNjFg}{khcwSnx1QvCdkEb0O1Gfaw}{<<hostname>>}{127.0.0.1}{127.0.0.1:9300}{cdfhilmrstw}{8.7.0}]}, term: 6, version: 66, reason: Publication{term=6, version=66}
[2023-04-03T12:51:07,669][INFO ][o.e.r.s.FileSettingsService] [<<hostname>>] starting file settings watcher ...
[2023-04-03T12:51:07,686][INFO ][o.e.h.AbstractHttpServerTransport] [<<hostname>>] publish_address {<<IP address>>:9200}, bound_addresses {0.0.0.0:9200}
[2023-04-03T12:51:07,686][INFO ][o.e.n.Node ] [<<hostname>>] started {<<hostname>>}{shddce8aRmO1wQDsSpNjFg}{khcwSnx1QvCdkEb0O1Gfaw}{<<hostname>>}{127.0.0.1}{127.0.0.1:9300}{cdfhilmrstw}{8.7.0}{ml.allocated_processors=2, ml.machine_memory=3089772544, xpack.installed=true, ml.allocated_processors_double=2.0, ml.max_jvm_size=1547698176}
[2023-04-03T12:51:07,701][INFO ][o.e.c.c.NodeJoinExecutor ] [<<hostname>>] node-join: [{<<hostname>>}{shddce8aRmO1wQDsSpNjFg}{khcwSnx1QvCdkEb0O1Gfaw}{<<hostname>>}{127.0.0.1}{127.0.0.1:9300}{cdfhilmrstw}{8.7.0}] with reason [completing election]
[2023-04-03T12:51:07,704][INFO ][o.e.r.s.FileSettingsService] [<<hostname>>] file settings service up and running [tid=54]
[2023-04-03T12:51:07,801][INFO ][o.e.x.c.t.IndexTemplateRegistry] [<<hostname>>] upgrading legacy template [.monitoring-alerts-7] for [monitoring] from version [8010099] to version [8070099]
[2023-04-03T12:51:07,802][INFO ][o.e.x.c.t.IndexTemplateRegistry] [<<hostname>>] upgrading legacy template [.monitoring-beats] for [monitoring] from version [8010099] to version [8070099]
[2023-04-03T12:51:07,802][INFO ][o.e.x.c.t.IndexTemplateRegistry] [<<hostname>>] upgrading legacy template [.monitoring-es] for [monitoring] from version [8010099] to version [8070099]
[2023-04-03T12:51:07,810][INFO ][o.e.x.c.t.IndexTemplateRegistry] [<<hostname>>] upgrading legacy template [.monitoring-kibana] for [monitoring] from version [8010099] to version [8070099]
[2023-04-03T12:51:07,810][INFO ][o.e.x.c.t.IndexTemplateRegistry] [<<hostname>>] upgrading legacy template [.monitoring-logstash] for [monitoring] from version [8010099] to version [8070099]
[2023-04-03T12:51:07,813][INFO ][o.e.x.c.t.IndexTemplateRegistry] [<<hostname>>] upgrading composable template [.monitoring-es-mb] for [monitoring] from version [8000103] to version [8000104]
[2023-04-03T12:51:07,818][INFO ][o.e.x.c.t.IndexTemplateRegistry] [<<hostname>>] upgrading composable template [.monitoring-ent-search-mb] for [monitoring] from version [8000103] to version [8000104]
[2023-04-03T12:51:07,818][INFO ][o.e.x.c.t.IndexTemplateRegistry] [<<hostname>>] upgrading composable template [.monitoring-logstash-mb] for [monitoring] from version [8000103] to version [8000104]
[2023-04-03T12:51:07,818][INFO ][o.e.x.c.t.IndexTemplateRegistry] [<<hostname>>] upgrading composable template [.monitoring-kibana-mb] for [monitoring] from version [8000103] to version [8000104]
[2023-04-03T12:51:07,818][INFO ][o.e.x.c.t.IndexTemplateRegistry] [<<hostname>>] upgrading composable template [.monitoring-beats-mb] for [monitoring] from version [8000103] to version [8000104]
[2023-04-03T12:51:07,819][INFO ][o.e.x.c.t.IndexTemplateRegistry] [<<hostname>>] upgrading composable template [.ml-anomalies-] for [ml] from version [8060299] to version [8070099]
[2023-04-03T12:51:07,819][INFO ][o.e.x.c.t.IndexTemplateRegistry] [<<hostname>>] upgrading composable template [.ml-state] for [ml] from version [8060299] to version [8070099]
[2023-04-03T12:51:07,826][INFO ][o.e.x.c.t.IndexTemplateRegistry] [<<hostname>>] upgrading composable template [.ml-stats] for [ml] from version [8060299] to version [8070099]
[2023-04-03T12:51:07,826][INFO ][o.e.x.c.t.IndexTemplateRegistry] [<<hostname>>] upgrading composable template [.ml-notifications-000002] for [ml] from version [8060299] to version [8070099]
[2023-04-03T12:51:07,893][INFO ][o.e.l.LicenseService ] [<<hostname>>] license [2d426a2c-0590-4825-ad60-72d0c197729e] mode [basic] - valid
[2023-04-03T12:51:07,895][INFO ][o.e.x.s.a.Realms ] [<<hostname>>] license mode is [basic], currently licensed security realms are [reserved/reserved,file/default_file,native/default_native]
[2023-04-03T12:51:07,903][INFO ][o.e.g.GatewayService ] [<<hostname>>] recovered [2] indices into cluster_state
[2023-04-03T12:51:08,030][INFO ][o.e.c.m.MetadataIndexTemplateService] [<<hostname>>] adding template [.monitoring-kibana] for index patterns [.monitoring-kibana-7-*]
[2023-04-03T12:51:08,071][INFO ][o.e.c.m.MetadataIndexTemplateService] [<<hostname>>] adding template [.monitoring-es] for index patterns [.monitoring-es-7-*]
[2023-04-03T12:51:08,086][INFO ][o.e.c.m.MetadataIndexTemplateService] [<<hostname>>] adding template [.monitoring-alerts-7] for index patterns [.monitoring-alerts-7]
[2023-04-03T12:51:08,107][INFO ][o.e.c.m.MetadataIndexTemplateService] [<<hostname>>] adding template [.monitoring-beats] for index patterns [.monitoring-beats-7-*]
[2023-04-03T12:51:08,115][INFO ][o.e.c.m.MetadataIndexTemplateService] [<<hostname>>] adding template [.monitoring-logstash] for index patterns [.monitoring-logstash-7-*]
[2023-04-03T12:51:08,137][INFO ][o.e.c.m.MetadataIndexTemplateService] [<<hostname>>] updating index template [.monitoring-ent-search-mb] for index patterns [.monitoring-ent-search-8-*]
[2023-04-03T12:51:08,148][INFO ][o.e.c.m.MetadataIndexTemplateService] [<<hostname>>] updating index template [.monitoring-logstash-mb] for index patterns [.monitoring-logstash-8-*]
[2023-04-03T12:51:08,164][INFO ][o.e.c.m.MetadataIndexTemplateService] [<<hostname>>] updating index template [.monitoring-kibana-mb] for index patterns [.monitoring-kibana-8-*]
[2023-04-03T12:51:08,191][INFO ][o.e.c.m.MetadataIndexTemplateService] [<<hostname>>] updating index template [.monitoring-beats-mb] for index patterns [.monitoring-beats-8-*]
[2023-04-03T12:51:08,236][INFO ][o.e.c.m.MetadataIndexTemplateService] [<<hostname>>] updating index template [.ml-anomalies-] for index patterns [.ml-anomalies-*]
[2023-04-03T12:51:08,243][INFO ][o.e.c.m.MetadataIndexTemplateService] [<<hostname>>] updating index template [.ml-stats] for index patterns [.ml-stats-*]
[2023-04-03T12:51:08,253][INFO ][o.e.c.m.MetadataIndexTemplateService] [<<hostname>>] updating index template [.ml-notifications-000002] for index patterns [.ml-notifications-000002]
[2023-04-03T12:51:08,263][INFO ][o.e.c.m.MetadataIndexTemplateService] [<<hostname>>] updating index template [.ml-state] for index patterns [.ml-state*]
[2023-04-03T12:51:08,312][INFO ][o.e.c.m.MetadataIndexTemplateService] [<<hostname>>] updating index template [.monitoring-es-mb] for index patterns [.monitoring-es-8-*]
[2023-04-03T12:51:08,326][INFO ][o.e.c.m.MetadataIndexTemplateService] [<<hostname>>] adding index template [.fleet-file-data] for index patterns [.fleet-file-data-*-*]
[2023-04-03T12:51:08,330][INFO ][o.e.c.m.MetadataIndexTemplateService] [<<hostname>>] adding index template [.fleet-files] for index patterns [.fleet-files-*-*]
[2023-04-03T12:51:08,504][INFO ][o.e.x.i.a.TransportPutLifecycleAction] [<<hostname>>] adding index lifecycle policy [.fleet-files-ilm-policy]
Can you please format your code/logs/config using the </> button, or markdown style back ticks. It helps to make things easy to read which helps us help you 
Apologies - I had not seen that that was possible. I've now corrected that in my earlier posts here. (Hanging around to discover what was possible on this site is not encouraged by what is presumably its broken JavaScript, which makes portions of the page jump rythmically - I cannot wait to close this browser tab.)
I get the same thing. It looks like a logging misconfiguration problem. It is supposed to be logging a harmless INFO-level message but do to the bug it's getting turned into the WARN-level message you see. We need to fix it to avoid confusion, but looks like it's actually harmless and you can ignore it for now. Here's the ticket for the bug if you'd like to follow it -- Configure Java Util Logging bridge · Issue #94613 · elastic/elasticsearch · GitHub.
Many thanks @Keith_Massey . This issue can be closed as far as I'm concerned.
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