Not enough information about migration failure in upgrade assistant

[bhavyarm]

Kibana version: 7.16.0 BC2

Elasticsearch version: 7.16.0 BC2

Server OS version: darwin_x86_64

Browser version: chrome latest

Browser OS version: OS X

Original install method (e.g. download page, yum, from source, etc.): from staging

Describe the bug: I upgraded my cluster from 6.8.20->7.12.1->7.16.0 in preparation for upgrading to 8.0.0 beta1.
While running through steps in upgrade assistant - migrate indices - I have System indices migration failed without much details.

Upgrade assistant is displaying - and no other details in the call out panel for "View Migration Details"

An error ocurred while migrating system indices for kibana: mapper_parsing_exception

ES Logs:

[2021-10-28T11:48:27,803][INFO ][o.e.c.m.MetadataCreateIndexService] [Bhavyas-MacBook-Pro.local] failed on parsing mappings on index creation [.kibana_1-reindexed-for-8]
org.elasticsearch.index.mapper.MapperParsingException: Failed to parse mapping [_doc]: Root mapping definition has unsupported parameters:  [doc : {dynamic=strict, properties={ml-telemetry={properties={file_data_visualizer={properties={index_creation_count={type=long}}}}}, server={properties={uuid={type=keyword}}}, visualization={properties={savedSearchId={type=keyword}, description={type=text}, uiStateJSON={type=text}, title={type=text}, version={type=integer}, kibanaSavedObjectMeta={properties={searchSourceJSON={type=text}}}, visState={type=text}}}, apm-telemetry={properties={has_any_services={type=boolean}, services_per_agent={properties={python={null_value=0, type=long}, java={null_value=0, type=long}, go={null_value=0, type=long}, nodejs={null_value=0, type=long}, js-base={null_value=0, type=long}, ruby={null_value=0, type=long}}}}}, graph-workspace={properties={numVertices={type=integer}, description={type=text}, numLinks={type=integer}, title={type=text}, version={type=integer}, kibanaSavedObjectMeta={properties={searchSourceJSON={type=text}}}, wsState={type=text}}}, kql-telemetry={properties={optInCount={type=long}, optOutCount={type=long}}}, type={type=keyword}, infrastructure-ui-source={properties={logAlias={type=keyword}, metricAlias={type=keyword}, name={type=text}, description={type=text}, fields={properties={container={type=keyword}, pod={type=keyword}, host={type=keyword}, tiebreaker={type=keyword}, timestamp={type=keyword}}}}}, space={properties={color={type=keyword}, _reserved={type=boolean}, initials={type=keyword}, name={type=text, fields={keyword={ignore_above=2048, type=keyword}}}, description={type=text}}}, url={properties={accessCount={type=long}, accessDate={type=date}, url={type=text, fields={keyword={ignore_above=2048, type=keyword}}}, createDate={type=date}}}, migrationVersion={dynamic=true, properties={index-pattern={type=text, fields={keyword={ignore_above=256, type=keyword}}}, visualization={type=text, fields={keyword={ignore_above=256, type=keyword}}}}}, index-pattern={properties={notExpandable={type=boolean}, fieldFormatMap={type=text}, sourceFilters={type=text}, typeMeta={type=keyword}, timeFieldName={type=keyword}, intervalName={type=keyword}, fields={type=text}, title={type=text}, type={type=keyword}}}, upgrade-assistant-reindex-operation={dynamic=true, properties={indexName={type=keyword}, status={type=integer}}}, search={properties={hits={type=integer}, columns={type=keyword}, description={type=text}, sort={type=keyword}, title={type=text}, version={type=integer}, kibanaSavedObjectMeta={properties={searchSourceJSON={type=text}}}}}, updated_at={type=date}, canvas-workpad={dynamic=false, properties={@created={type=date}, @timestamp={type=date}, name={type=text, fields={keyword={type=keyword}}}, id={index=false, type=text}}}, maps-telemetry={properties={mapsTotalCount={type=long}, attributesPerMap={properties={emsVectorLayersCount={dynamic=true, type=object}, layerTypesCount={dynamic=true, type=object}, dataSourcesCount={properties={avg={type=long}, min={type=long}, max={type=long}}}, layersCount={properties={avg={type=long}, min={type=long}, max={type=long}}}}}, timeCaptured={type=date}}}, namespace={type=keyword}, telemetry={properties={enabled={type=boolean}}}, timelion-sheet={properties={hits={type=integer}, timelion_sheet={type=text}, timelion_interval={type=keyword}, timelion_columns={type=integer}, timelion_other_interval={type=keyword}, timelion_rows={type=integer}, description={type=text}, title={type=text}, version={type=integer}, kibanaSavedObjectMeta={properties={searchSourceJSON={type=text}}}, timelion_chart_height={type=integer}}}, config={dynamic=true, properties={buildNum={type=keyword}, defaultIndex={type=text, fields={keyword={ignore_above=256, type=keyword}}}}}, map={properties={bounds={type=geo_shape}, mapStateJSON={type=text}, description={type=text}, layerListJSON={type=text}, uiStateJSON={type=text}, title={type=text}, version={type=integer}}}, dashboard={properties={hits={type=integer}, timeFrom={type=keyword}, timeTo={type=keyword}, refreshInterval={properties={display={type=keyword}, section={type=integer}, value={type=integer}, pause={type=boolean}}}, description={type=text}, uiStateJSON={type=text}, timeRestore={type=boolean}, title={type=text}, version={type=integer}, kibanaSavedObjectMeta={properties={searchSourceJSON={type=text}}}, optionsJSON={type=text}, panelsJSON={type=text}}}, upgrade-assistant-telemetry={properties={features={properties={deprecation_logging={properties={enabled={null_value=true, type=boolean}}}}}, ui_open={properties={cluster={null_value=0, type=long}, overview={null_value=0, type=long}, indices={null_value=0, type=long}}}, ui_reindex={properties={stop={null_value=0, type=long}, start={null_value=0, type=long}, close={null_value=0, type=long}, open={null_value=0, type=long}}}}}}}]
	at org.elasticsearch.index.mapper.MapperService.parseMappings(MapperService.java:436) ~[elasticsearch-7.16.0.jar:7.16.0]
	at org.elasticsearch.index.mapper.MapperService.mergeAndApplyMappings(MapperService.java:352) ~[elasticsearch-7.16.0.jar:7.16.0]
	at org.elasticsearch.index.mapper.MapperService.merge(MapperService.java:335) ~[elasticsearch-7.16.0.jar:7.16.0]
	at org.elasticsearch.cluster.metadata.MetadataCreateIndexService.updateIndexMappingsAndBuildSortOrder(MetadataCreateIndexService.java:1109) ~[elasticsearch-7.16.0.jar:7.16.0]
	at org.elasticsearch.cluster.metadata.MetadataCreateIndexService.lambda$applyCreateIndexWithTemporaryService$3(MetadataCreateIndexService.java:424) [elasticsearch-7.16.0.jar:7.16.0]
	at org.elasticsearch.indices.IndicesService.withTempIndexService(IndicesService.java:632) [elasticsearch-7.16.0.jar:7.16.0]
	at org.elasticsearch.cluster.metadata.MetadataCreateIndexService.applyCreateIndexWithTemporaryService(MetadataCreateIndexService.java:422) [elasticsearch-7.16.0.jar:7.16.0]
	at org.elasticsearch.cluster.metadata.MetadataCreateIndexService.applyCreateIndexRequestWithV1Templates(MetadataCreateIndexService.java:509) [elasticsearch-7.16.0.jar:7.16.0]
	at org.elasticsearch.cluster.metadata.MetadataCreateIndexService.applyCreateIndexRequest(MetadataCreateIndexService.java:385) [elasticsearch-7.16.0.jar:7.16.0]
	at org.elasticsearch.cluster.metadata.MetadataCreateIndexService.applyCreateIndexRequest(MetadataCreateIndexService.java:392) [elasticsearch-7.16.0.jar:7.16.0]
	at org.elasticsearch.cluster.metadata.MetadataCreateIndexService$1.execute(MetadataCreateIndexService.java:309) [elasticsearch-7.16.0.jar:7.16.0]
	at org.elasticsearch.cluster.ClusterStateUpdateTask.execute(ClusterStateUpdateTask.java:48) [elasticsearch-7.16.0.jar:7.16.0]
	at org.elasticsearch.cluster.service.MasterService.executeTasks(MasterService.java:751) [elasticsearch-7.16.0.jar:7.16.0]
	at org.elasticsearch.cluster.service.MasterService.calculateTaskOutputs(MasterService.java:366) [elasticsearch-7.16.0.jar:7.16.0]
	at org.elasticsearch.cluster.service.MasterService.runTasks(MasterService.java:229) [elasticsearch-7.16.0.jar:7.16.0]
	at org.elasticsearch.cluster.service.MasterService.access$100(MasterService.java:63) [elasticsearch-7.16.0.jar:7.16.0]
	at org.elasticsearch.cluster.service.MasterService$Batcher.run(MasterService.java:161) [elasticsearch-7.16.0.jar:7.16.0]
	at org.elasticsearch.cluster.service.TaskBatcher.runIfNotProcessed(TaskBatcher.java:135) [elasticsearch-7.16.0.jar:7.16.0]
	at org.elasticsearch.cluster.service.TaskBatcher$BatchedTask.run(TaskBatcher.java:192) [elasticsearch-7.16.0.jar:7.16.0]
	at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingRunnable.run(ThreadContext.java:678) [elasticsearch-7.16.0.jar:7.16.0]
	at org.elasticsearch.common.util.concurrent.PrioritizedEsThreadPoolExecutor$TieBreakingPrioritizedRunnable.runAndClean(PrioritizedEsThreadPoolExecutor.java:259) [elasticsearch-7.16.0.jar:7.16.0]
	at org.elasticsearch.common.util.concurrent.PrioritizedEsThreadPoolExecutor$TieBreakingPrioritizedRunnable.run(PrioritizedEsThreadPoolExecutor.java:222) [elasticsearch-7.16.0.jar:7.16.0]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136) [?:?]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) [?:?]
	at java.lang.Thread.run(Thread.java:833) [?:?]

[elasticmachine]

Pinging @elastic/kibana-stack-management (Team:Stack Management)

[liza-mae]

Duplicate of #116209 which lists the open issues in this area via comment #116209 (comment)