Elasticsearch won't start after upgrade to 8.1.0

I upgraded Elasticsearch from 7.17 to 8.1.0 but since then I can start Elasticsearch. When I run systemctl status Elasticsearch.service I get this error. How can I fix this?

org.elasticsearch.bootstrap.StartupException: java.lang.IllegalStateException: Failed to parse mappings for index [[elastalert_status_status/lAP629u1ThqkE8JvQRy8pA]]
	at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:170) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:157) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.common.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:81) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:112) ~[elasticsearch-cli-8.1.0.jar:8.1.0]
	at org.elasticsearch.cli.Command.main(Command.java:77) ~[elasticsearch-cli-8.1.0.jar:8.1.0]
	at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:122) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:80) ~[elasticsearch-8.1.0.jar:8.1.0]
Caused by: java.lang.IllegalStateException: Failed to parse mappings for index [[elastalert_status_status/lAP629u1ThqkE8JvQRy8pA]]
	at org.elasticsearch.cluster.metadata.IndexMetadataVerifier.checkMappingsCompatibility(IndexMetadataVerifier.java:201) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.cluster.metadata.IndexMetadataVerifier.verifyIndexMetadata(IndexMetadataVerifier.java:93) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.gateway.GatewayMetaState.upgradeMetadata(GatewayMetaState.java:226) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.gateway.GatewayMetaState.upgradeMetadataForNode(GatewayMetaState.java:213) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.gateway.GatewayMetaState.start(GatewayMetaState.java:127) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.node.Node.start(Node.java:1142) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.bootstrap.Bootstrap.start(Bootstrap.java:272) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:367) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:166) ~[elasticsearch-8.1.0.jar:8.1.0]
	... 6 more
Caused by: org.elasticsearch.index.mapper.MapperParsingException: Failed to parse mapping: Error parsing [format] on field [@timestamp]: Invalid format: [dateOptionalTime]: Unknown pattern letter: t
	at org.elasticsearch.index.mapper.MapperService.parseMapping(MapperService.java:377) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.MapperService.merge(MapperService.java:352) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.MapperService.merge(MapperService.java:342) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.cluster.metadata.IndexMetadataVerifier.checkMappingsCompatibility(IndexMetadataVerifier.java:197) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.cluster.metadata.IndexMetadataVerifier.verifyIndexMetadata(IndexMetadataVerifier.java:93) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.gateway.GatewayMetaState.upgradeMetadata(GatewayMetaState.java:226) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.gateway.GatewayMetaState.upgradeMetadataForNode(GatewayMetaState.java:213) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.gateway.GatewayMetaState.start(GatewayMetaState.java:127) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.node.Node.start(Node.java:1142) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.bootstrap.Bootstrap.start(Bootstrap.java:272) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:367) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:166) ~[elasticsearch-8.1.0.jar:8.1.0]
	... 6 more
Caused by: java.lang.IllegalArgumentException: Error parsing [format] on field [@timestamp]: Invalid format: [dateOptionalTime]: Unknown pattern letter: t
	at org.elasticsearch.index.mapper.DateFieldMapper$Builder.buildFormatter(DateFieldMapper.java:280) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.DateFieldMapper$Builder.build(DateFieldMapper.java:332) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.DateFieldMapper$Builder.build(DateFieldMapper.java:219) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.ObjectMapper$Builder.buildMappers(ObjectMapper.java:157) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.RootObjectMapper$Builder.build(RootObjectMapper.java:110) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.MappingParser.parse(MappingParser.java:99) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.MappingParser.parse(MappingParser.java:94) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.MapperService.parseMapping(MapperService.java:375) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.MapperService.merge(MapperService.java:352) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.MapperService.merge(MapperService.java:342) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.cluster.metadata.IndexMetadataVerifier.checkMappingsCompatibility(IndexMetadataVerifier.java:197) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.cluster.metadata.IndexMetadataVerifier.verifyIndexMetadata(IndexMetadataVerifier.java:93) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.gateway.GatewayMetaState.upgradeMetadata(GatewayMetaState.java:226) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.gateway.GatewayMetaState.upgradeMetadataForNode(GatewayMetaState.java:213) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.gateway.GatewayMetaState.start(GatewayMetaState.java:127) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.node.Node.start(Node.java:1142) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.bootstrap.Bootstrap.start(Bootstrap.java:272) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:367) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:166) ~[elasticsearch-8.1.0.jar:8.1.0]
	... 6 more
Caused by: java.lang.IllegalArgumentException: Invalid format: [dateOptionalTime]: Unknown pattern letter: t
	at org.elasticsearch.common.time.DateFormatters.forPattern(DateFormatters.java:2138) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.common.time.DateFormatter.forPattern(DateFormatter.java:116) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.DateFieldMapper$Builder.buildFormatter(DateFieldMapper.java:278) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.DateFieldMapper$Builder.build(DateFieldMapper.java:332) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.DateFieldMapper$Builder.build(DateFieldMapper.java:219) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.ObjectMapper$Builder.buildMappers(ObjectMapper.java:157) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.RootObjectMapper$Builder.build(RootObjectMapper.java:110) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.MappingParser.parse(MappingParser.java:99) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.MappingParser.parse(MappingParser.java:94) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.MapperService.parseMapping(MapperService.java:375) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.MapperService.merge(MapperService.java:352) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.MapperService.merge(MapperService.java:342) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.cluster.metadata.IndexMetadataVerifier.checkMappingsCompatibility(IndexMetadataVerifier.java:197) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.cluster.metadata.IndexMetadataVerifier.verifyIndexMetadata(IndexMetadataVerifier.java:93) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.gateway.GatewayMetaState.upgradeMetadata(GatewayMetaState.java:226) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.gateway.GatewayMetaState.upgradeMetadataForNode(GatewayMetaState.java:213) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.gateway.GatewayMetaState.start(GatewayMetaState.java:127) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.node.Node.start(Node.java:1142) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.bootstrap.Bootstrap.start(Bootstrap.java:272) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:367) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:166) ~[elasticsearch-8.1.0.jar:8.1.0]
	... 6 more
Caused by: java.lang.IllegalArgumentException: Unknown pattern letter: t
	at java.time.format.DateTimeFormatterBuilder.parsePattern(DateTimeFormatterBuilder.java:1882) ~[?:?]
	at java.time.format.DateTimeFormatterBuilder.appendPattern(DateTimeFormatterBuilder.java:1772) ~[?:?]
	at org.elasticsearch.common.time.DateFormatters.forPattern(DateFormatters.java:2135) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.common.time.DateFormatter.forPattern(DateFormatter.java:116) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.DateFieldMapper$Builder.buildFormatter(DateFieldMapper.java:278) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.DateFieldMapper$Builder.build(DateFieldMapper.java:332) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.DateFieldMapper$Builder.build(DateFieldMapper.java:219) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.ObjectMapper$Builder.buildMappers(ObjectMapper.java:157) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.RootObjectMapper$Builder.build(RootObjectMapper.java:110) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.MappingParser.parse(MappingParser.java:99) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.MappingParser.parse(MappingParser.java:94) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.MapperService.parseMapping(MapperService.java:375) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.MapperService.merge(MapperService.java:352) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.MapperService.merge(MapperService.java:342) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.cluster.metadata.IndexMetadataVerifier.checkMappingsCompatibility(IndexMetadataVerifier.java:197) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.cluster.metadata.IndexMetadataVerifier.verifyIndexMetadata(IndexMetadataVerifier.java:93) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.gateway.GatewayMetaState.upgradeMetadata(GatewayMetaState.java:226) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.gateway.GatewayMetaState.upgradeMetadataForNode(GatewayMetaState.java:213) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.gateway.GatewayMetaState.start(GatewayMetaState.java:127) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.node.Node.start(Node.java:1142) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.bootstrap.Bootstrap.start(Bootstrap.java:272) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:367) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:166) ~[elasticsearch-8.1.0.jar:8.1.0]
	... 6 more

Welcome.

I believe that you did not run the upgrade assistant.
It would probably have tell you that you have deprecated settings/mappings.

The error here is:

Error parsing [format] on field [@timestamp]: Invalid format: [dateOptionalTime]: Unknown pattern letter: t

The format has changed in 7.x.
I don't know how you can fix that. May be you need to recreate the index with the proper settings/mappings?

thanks for your response
how can i do this (reindex) while elasticseach service is failed?

Could you share the full Elasticsearch logs?

[2022-03-15T17:14:25,451][INFO ][o.e.n.Node               ] [lsamt-mon1] version[8.1.0], pid[1370795], build[default/deb/3700f7679f7d95e36da0b43762189bab189bc53a/2022-03-03T14:20:00.690422633Z], OS[Linux/5.10.0-10-amd64/amd64], JVM[Eclipse Adoptium/OpenJDK 64-Bit Server VM/17.0.2/17.0.2+8]
[2022-03-15T17:14:25,457][INFO ][o.e.n.Node               ] [lsamt-mon1] JVM home [/usr/share/elasticsearch/jdk], using bundled JDK [true]
[2022-03-15T17:14:25,458][INFO ][o.e.n.Node               ] [lsamt-mon1] JVM arguments [-Xshare:auto, -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, -XX:+ShowCodeDetailsInExceptionMessages, -Dio.netty.noUnsafe=true, -Dio.netty.noKeySetOptimization=true, -Dio.netty.recycler.maxCapacityPerThread=0, -Dio.netty.allocator.numDirectArenas=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=/tmp/elasticsearch-12433393420122617599, -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,pid,tags:filecount=32,filesize=64m, -Xms16040m, -Xmx16040m, -XX:MaxDirectMemorySize=8409579520, -XX:InitiatingHeapOccupancyPercent=30, -XX:G1ReservePercent=25, -Des.path.home=/usr/share/elasticsearch, -Des.path.conf=/etc/elasticsearch, -Des.distribution.flavor=default, -Des.distribution.type=deb, -Des.bundled_jdk=true]
[2022-03-15T17:14:28,236][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [aggs-matrix-stats]
[2022-03-15T17:14:28,237][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [analysis-common]
[2022-03-15T17:14:28,238][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [constant-keyword]
[2022-03-15T17:14:28,239][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [data-streams]
[2022-03-15T17:14:28,239][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [frozen-indices]
[2022-03-15T17:14:28,240][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [ingest-common]
[2022-03-15T17:14:28,240][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [ingest-geoip]
[2022-03-15T17:14:28,240][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [ingest-user-agent]
[2022-03-15T17:14:28,241][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [kibana]
[2022-03-15T17:14:28,241][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [lang-expression]
[2022-03-15T17:14:28,241][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [lang-mustache]
[2022-03-15T17:14:28,242][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [lang-painless]
[2022-03-15T17:14:28,242][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [legacy-geo]
[2022-03-15T17:14:28,243][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [mapper-extras]
[2022-03-15T17:14:28,243][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [mapper-version]
[2022-03-15T17:14:28,244][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [old-lucene-versions]
[2022-03-15T17:14:28,244][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [parent-join]
[2022-03-15T17:14:28,244][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [percolator]
[2022-03-15T17:14:28,245][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [rank-eval]
[2022-03-15T17:14:28,245][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [reindex]
[2022-03-15T17:14:28,245][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [repositories-metering-api]
[2022-03-15T17:14:28,246][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [repository-azure]
[2022-03-15T17:14:28,246][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [repository-encrypted]
[2022-03-15T17:14:28,247][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [repository-gcs]
[2022-03-15T17:14:28,247][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [repository-s3]
[2022-03-15T17:14:28,248][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [repository-url]
[2022-03-15T17:14:28,248][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [runtime-fields-common]
[2022-03-15T17:14:28,248][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [search-business-rules]
[2022-03-15T17:14:28,249][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [searchable-snapshots]
[2022-03-15T17:14:28,249][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [snapshot-based-recoveries]
[2022-03-15T17:14:28,249][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [snapshot-repo-test-kit]
[2022-03-15T17:14:28,249][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [spatial]
[2022-03-15T17:14:28,250][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [systemd]
[2022-03-15T17:14:28,250][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [transform]
[2022-03-15T17:14:28,250][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [transport-netty4]
[2022-03-15T17:14:28,250][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [unsigned-long]
[2022-03-15T17:14:28,250][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [vector-tile]
[2022-03-15T17:14:28,251][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [vectors]
[2022-03-15T17:14:28,251][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [wildcard]
[2022-03-15T17:14:28,251][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [x-pack-aggregate-metric]
[2022-03-15T17:14:28,251][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [x-pack-analytics]
[2022-03-15T17:14:28,251][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [x-pack-async]
[2022-03-15T17:14:28,252][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [x-pack-async-search]
[2022-03-15T17:14:28,252][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [x-pack-autoscaling]
[2022-03-15T17:14:28,252][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [x-pack-ccr]
[2022-03-15T17:14:28,252][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [x-pack-core]
[2022-03-15T17:14:28,252][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [x-pack-deprecation]
[2022-03-15T17:14:28,253][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [x-pack-enrich]
[2022-03-15T17:14:28,253][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [x-pack-eql]
[2022-03-15T17:14:28,253][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [x-pack-fleet]
[2022-03-15T17:14:28,253][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [x-pack-graph]
[2022-03-15T17:14:28,253][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [x-pack-identity-provider]
[2022-03-15T17:14:28,254][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [x-pack-ilm]
[2022-03-15T17:14:28,254][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [x-pack-logstash]
[2022-03-15T17:14:28,254][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [x-pack-ml]
[2022-03-15T17:14:28,254][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [x-pack-monitoring]
[2022-03-15T17:14:28,254][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [x-pack-ql]
[2022-03-15T17:14:28,254][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [x-pack-rollup]
[2022-03-15T17:14:28,255][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [x-pack-security]
[2022-03-15T17:14:28,255][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [x-pack-shutdown]
[2022-03-15T17:14:28,255][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [x-pack-sql]
[2022-03-15T17:14:28,255][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [x-pack-stack]
[2022-03-15T17:14:28,255][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [x-pack-text-structure]
[2022-03-15T17:14:28,256][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [x-pack-voting-only-node]
[2022-03-15T17:14:28,256][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] loaded module [x-pack-watcher]
[2022-03-15T17:14:28,257][INFO ][o.e.p.PluginsService     ] [lsamt-mon1] no plugins loaded
[2022-03-15T17:14:28,313][INFO ][o.e.e.NodeEnvironment    ] [lsamt-mon1] using [1] data paths, mounts [[/var/lib/elasticsearch (/dev/sda4)]], net usable_space [143.7gb], net total_space [737.2gb], types [ext4]
[2022-03-15T17:14:28,314][INFO ][o.e.e.NodeEnvironment    ] [lsamt-mon1] heap size [15.6gb], compressed ordinary object pointers [true]
[2022-03-15T17:14:28,715][INFO ][o.e.n.Node               ] [lsamt-mon1] node name [lsamt-mon1], node ID [igvg-i5rTyOzTTDFImsaQw], cluster name [elasticsearch], roles [ingest, data_frozen, ml, data_hot, transform, data_content, data_warm, master, remote_cluster_client, data, data_cold]
[2022-03-15T17:14:33,832][INFO ][o.e.x.m.p.l.CppLogMessageHandler] [lsamt-mon1] [controller/1371080] [Main.cc@123] controller (64 bit): Version 8.1.0 (Build 36e2300340f08a) Copyright (c) 2022 Elasticsearch BV
[2022-03-15T17:14:34,013][INFO ][o.e.x.s.Security         ] [lsamt-mon1] Security is enabled
[2022-03-15T17:14:34,450][INFO ][o.e.x.s.a.Realms         ] [lsamt-mon1] license mode is [trial], currently licensed security realms are [reserved/reserved,file/default_file,native/default_native]
[2022-03-15T17:14:34,461][INFO ][o.e.x.s.a.s.FileRolesStore] [lsamt-mon1] parsed [0] roles from file [/etc/elasticsearch/roles.yml]
[2022-03-15T17:14:36,425][INFO ][o.e.t.n.NettyAllocator   ] [lsamt-mon1] 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=8mb}]
[2022-03-15T17:14:36,465][INFO ][o.e.i.r.RecoverySettings ] [lsamt-mon1] using rate limit [40mb] with [default=40mb, read=0b, write=0b, max=0b]
[2022-03-15T17:14:36,514][INFO ][o.e.d.DiscoveryModule    ] [lsamt-mon1] using discovery type [multi-node] and seed hosts providers [settings]
[2022-03-15T17:14:37,648][INFO ][o.e.n.Node               ] [lsamt-mon1] initialized
[2022-03-15T17:14:37,648][INFO ][o.e.n.Node               ] [lsamt-mon1] starting ...
[2022-03-15T17:14:37,728][INFO ][o.e.x.s.c.f.PersistentCache] [lsamt-mon1] persistent cache index loaded
[2022-03-15T17:14:37,729][INFO ][o.e.x.d.l.DeprecationIndexingComponent] [lsamt-mon1] deprecation component started
[2022-03-15T17:14:37,855][INFO ][o.e.t.TransportService   ] [lsamt-mon1] publish_address {127.0.0.1:9300}, bound_addresses {[::1]:9300}, {127.0.0.1:9300}
[2022-03-15T17:14:41,144][ERROR][o.e.b.ElasticsearchUncaughtExceptionHandler] [lsamt-mon1] uncaught exception in thread [main]
org.elasticsearch.bootstrap.StartupException: java.lang.IllegalStateException: Failed to parse mappings for index [[elastalert_status/Lcf0MNyfRKaOfyol4q4b9g]]
	at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:170) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:157) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.common.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:81) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:112) ~[elasticsearch-cli-8.1.0.jar:8.1.0]
	at org.elasticsearch.cli.Command.main(Command.java:77) ~[elasticsearch-cli-8.1.0.jar:8.1.0]
	at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:122) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:80) ~[elasticsearch-8.1.0.jar:8.1.0]
Caused by: java.lang.IllegalStateException: Failed to parse mappings for index [[elastalert_status/Lcf0MNyfRKaOfyol4q4b9g]]
	at org.elasticsearch.cluster.metadata.IndexMetadataVerifier.checkMappingsCompatibility(IndexMetadataVerifier.java:201) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.cluster.metadata.IndexMetadataVerifier.verifyIndexMetadata(IndexMetadataVerifier.java:93) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.gateway.GatewayMetaState.upgradeMetadata(GatewayMetaState.java:226) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.gateway.GatewayMetaState.upgradeMetadataForNode(GatewayMetaState.java:213) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.gateway.GatewayMetaState.start(GatewayMetaState.java:127) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.node.Node.start(Node.java:1142) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.bootstrap.Bootstrap.start(Bootstrap.java:272) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:367) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:166) ~[elasticsearch-8.1.0.jar:8.1.0]
	... 6 more
Caused by: org.elasticsearch.index.mapper.MapperParsingException: Failed to parse mapping: Error parsing [format] on field [@timestamp]: Invalid format: [dateOptionalTime]: Unknown pattern letter: t
	at org.elasticsearch.index.mapper.MapperService.parseMapping(MapperService.java:377) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.MapperService.merge(MapperService.java:352) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.MapperService.merge(MapperService.java:342) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.cluster.metadata.IndexMetadataVerifier.checkMappingsCompatibility(IndexMetadataVerifier.java:197) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.cluster.metadata.IndexMetadataVerifier.verifyIndexMetadata(IndexMetadataVerifier.java:93) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.gateway.GatewayMetaState.upgradeMetadata(GatewayMetaState.java:226) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.gateway.GatewayMetaState.upgradeMetadataForNode(GatewayMetaState.java:213) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.gateway.GatewayMetaState.start(GatewayMetaState.java:127) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.node.Node.start(Node.java:1142) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.bootstrap.Bootstrap.start(Bootstrap.java:272) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:367) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:166) ~[elasticsearch-8.1.0.jar:8.1.0]
	... 6 more
Caused by: java.lang.IllegalArgumentException: Error parsing [format] on field [@timestamp]: Invalid format: [dateOptionalTime]: Unknown pattern letter: t
	at org.elasticsearch.index.mapper.DateFieldMapper$Builder.buildFormatter(DateFieldMapper.java:280) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.DateFieldMapper$Builder.build(DateFieldMapper.java:332) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.DateFieldMapper$Builder.build(DateFieldMapper.java:219) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.ObjectMapper$Builder.buildMappers(ObjectMapper.java:157) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.RootObjectMapper$Builder.build(RootObjectMapper.java:110) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.MappingParser.parse(MappingParser.java:99) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.MappingParser.parse(MappingParser.java:94) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.MapperService.parseMapping(MapperService.java:375) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.MapperService.merge(MapperService.java:352) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.MapperService.merge(MapperService.java:342) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.cluster.metadata.IndexMetadataVerifier.checkMappingsCompatibility(IndexMetadataVerifier.java:197) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.cluster.metadata.IndexMetadataVerifier.verifyIndexMetadata(IndexMetadataVerifier.java:93) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.gateway.GatewayMetaState.upgradeMetadata(GatewayMetaState.java:226) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.gateway.GatewayMetaState.upgradeMetadataForNode(GatewayMetaState.java:213) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.gateway.GatewayMetaState.start(GatewayMetaState.java:127) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.node.Node.start(Node.java:1142) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.bootstrap.Bootstrap.start(Bootstrap.java:272) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:367) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:166) ~[elasticsearch-8.1.0.jar:8.1.0]
	... 6 more
Caused by: java.lang.IllegalArgumentException: Invalid format: [dateOptionalTime]: Unknown pattern letter: t
	at org.elasticsearch.common.time.DateFormatters.forPattern(DateFormatters.java:2138) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.common.time.DateFormatter.forPattern(DateFormatter.java:116) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.DateFieldMapper$Builder.buildFormatter(DateFieldMapper.java:278) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.DateFieldMapper$Builder.build(DateFieldMapper.java:332) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.DateFieldMapper$Builder.build(DateFieldMapper.java:219) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.ObjectMapper$Builder.buildMappers(ObjectMapper.java:157) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.RootObjectMapper$Builder.build(RootObjectMapper.java:110) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.MappingParser.parse(MappingParser.java:99) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.MappingParser.parse(MappingParser.java:94) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.MapperService.parseMapping(MapperService.java:375) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.MapperService.merge(MapperService.java:352) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.MapperService.merge(MapperService.java:342) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.cluster.metadata.IndexMetadataVerifier.checkMappingsCompatibility(IndexMetadataVerifier.java:197) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.cluster.metadata.IndexMetadataVerifier.verifyIndexMetadata(IndexMetadataVerifier.java:93) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.gateway.GatewayMetaState.upgradeMetadata(GatewayMetaState.java:226) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.gateway.GatewayMetaState.upgradeMetadataForNode(GatewayMetaState.java:213) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.gateway.GatewayMetaState.start(GatewayMetaState.java:127) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.node.Node.start(Node.java:1142) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.bootstrap.Bootstrap.start(Bootstrap.java:272) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:367) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:166) ~[elasticsearch-8.1.0.jar:8.1.0]
	... 6 more
Caused by: java.lang.IllegalArgumentException: Unknown pattern letter: t
	at java.time.format.DateTimeFormatterBuilder.parsePattern(DateTimeFormatterBuilder.java:1882) ~[?:?]
	at java.time.format.DateTimeFormatterBuilder.appendPattern(DateTimeFormatterBuilder.java:1772) ~[?:?]
	at org.elasticsearch.common.time.DateFormatters.forPattern(DateFormatters.java:2135) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.common.time.DateFormatter.forPattern(DateFormatter.java:116) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.DateFieldMapper$Builder.buildFormatter(DateFieldMapper.java:278) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.DateFieldMapper$Builder.build(DateFieldMapper.java:332) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.DateFieldMapper$Builder.build(DateFieldMapper.java:219) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.ObjectMapper$Builder.buildMappers(ObjectMapper.java:157) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.RootObjectMapper$Builder.build(RootObjectMapper.java:110) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.MappingParser.parse(MappingParser.java:99) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.MappingParser.parse(MappingParser.java:94) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.MapperService.parseMapping(MapperService.java:375) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.MapperService.merge(MapperService.java:352) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.index.mapper.MapperService.merge(MapperService.java:342) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.cluster.metadata.IndexMetadataVerifier.checkMappingsCompatibility(IndexMetadataVerifier.java:197) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.cluster.metadata.IndexMetadataVerifier.verifyIndexMetadata(IndexMetadataVerifier.java:93) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.gateway.GatewayMetaState.upgradeMetadata(GatewayMetaState.java:226) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.gateway.GatewayMetaState.upgradeMetadataForNode(GatewayMetaState.java:213) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.gateway.GatewayMetaState.start(GatewayMetaState.java:127) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.node.Node.start(Node.java:1142) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.bootstrap.Bootstrap.start(Bootstrap.java:272) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:367) ~[elasticsearch-8.1.0.jar:8.1.0]
	at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:166) ~[elasticsearch-8.1.0.jar:8.1.0]
	... 6 more
uncaught exception in thread [main]
java.lang.IllegalStateException: Failed to parse mappings for index [[elastalert_status/Lcf0MNyfRKaOfyol4q4b9g]]
Likely root cause: java.lang.IllegalArgumentException: Unknown pattern letter: t
	at java.base/java.time.format.DateTimeFormatterBuilder.parsePattern(DateTimeFormatterBuilder.java:1882)
	at java.base/java.time.format.DateTimeFormatterBuilder.appendPattern(DateTimeFormatterBuilder.java:1772)
	at org.elasticsearch.common.time.DateFormatters.forPattern(DateFormatters.java:2135)
	at org.elasticsearch.common.time.DateFormatter.forPattern(DateFormatter.java:116)
	at org.elasticsearch.index.mapper.DateFieldMapper$Builder.buildFormatter(DateFieldMapper.java:278)
	at org.elasticsearch.index.mapper.DateFieldMapper$Builder.build(DateFieldMapper.java:332)
	at org.elasticsearch.index.mapper.DateFieldMapper$Builder.build(DateFieldMapper.java:219)
	at org.elasticsearch.index.mapper.ObjectMapper$Builder.buildMappers(ObjectMapper.java:157)
	at org.elasticsearch.index.mapper.RootObjectMapper$Builder.build(RootObjectMapper.java:110)
	at org.elasticsearch.index.mapper.MappingParser.parse(MappingParser.java:99)
	at org.elasticsearch.index.mapper.MappingParser.parse(MappingParser.java:94)
	at org.elasticsearch.index.mapper.MapperService.parseMapping(MapperService.java:375)
	at org.elasticsearch.index.mapper.MapperService.merge(MapperService.java:352)
	at org.elasticsearch.index.mapper.MapperService.merge(MapperService.java:342)
	at org.elasticsearch.cluster.metadata.IndexMetadataVerifier.checkMappingsCompatibility(IndexMetadataVerifier.java:197)
	at org.elasticsearch.cluster.metadata.IndexMetadataVerifier.verifyIndexMetadata(IndexMetadataVerifier.java:93)
	at org.elasticsearch.gateway.GatewayMetaState.upgradeMetadata(GatewayMetaState.java:226)
	at org.elasticsearch.gateway.GatewayMetaState.upgradeMetadataForNode(GatewayMetaState.java:213)
	at org.elasticsearch.gateway.GatewayMetaState.start(GatewayMetaState.java:127)
	at org.elasticsearch.node.Node.start(Node.java:1142)
	at org.elasticsearch.bootstrap.Bootstrap.start(Bootstrap.java:272)
	at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:367)
	at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:166)
	at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:157)
	at org.elasticsearch.common.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:81)
	at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:112)
	at org.elasticsearch.cli.Command.main(Command.java:77)
	at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:122)
	at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:80)
[2022-03-15T17:14:41,149][INFO ][o.e.n.Node               ] [lsamt-mon1] stopping ...
[2022-03-15T17:14:41,216][INFO ][o.e.n.Node               ] [lsamt-mon1] stopped
[2022-03-15T17:14:41,217][INFO ][o.e.n.Node               ] [lsamt-mon1] closing ...
[2022-03-15T17:14:41,226][INFO ][o.e.n.Node               ] [lsamt-mon1] closed
[2022-03-15T17:14:41,228][INFO ][o.e.x.m.p.NativeController] [lsamt-mon1] Native controller process has stopped - no new native processes can be started

Could you restart a 7.17 cluster and restore your backup?
Then go to the upgrade tool and fix the issues before doing again the upgrade?

It's kind of weird that you can not start the cluster because of one index.

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