[Fleet] Kibana cannot start (so e2e test times out connecting to ES)

[EricDavisX]

Kibana 8.0 snapshot latest version as of Jan 27 afternoon. Manu reports the tests this morning were working... started failing around 10 AM EST

• example: https://beats-ci.elastic.co/job/e2e-tests/job/e2e-testing-mbp/job/master/239/parameters/

working, earlier test: https://beats-ci.elastic.co/blue/organizations/jenkins/e2e-tests%2Fe2e-testing-mbp/detail/PR-669/5/pipeline
hours later today: https://beats-ci.elastic.co/blue/organizations/jenkins/e2e-tests%2Fe2e-testing-mbp/detail/PR-669/7/pipeline

Original install method (e.g. download page, yum, from source, etc.):
snapshots / obs ci-snapshots

Steps to reproduce:
run the e2e-test and see the cited problem

Expected behavior:
test passes : /

Errors in browser console (if relevant):
{"type":"log","@timestamp":"2021-01-27T19:34:42+00:00","tags":["warning","plugins","licensing"],"pid":8,"message":"License information could not be obtained from Elasticsearch due to Error: Cluster client cannot be used after it has been closed. error"}

Provide logs and/or server output (if relevant):
Nicolas Chaulet cites: also there is a change to the saved object migration that has been merged today can be related

he notes this from the following, the line migration failed, dumping execution
...seems like there is a migration issue somewhere

full log:
kibana-logs.log

[elasticmachine]

Pinging @elastic/ingest-management (Team:Ingest Management)

[EricDavisX]

@mdelapenya thanks for raising this. @ph it is going to block our e2e tests until it is solved.

[mdelapenya]

Just to mention, kibana is not even starting before any test runs. Running latest kibana and Elasticsearch 8.0.0-SNAPSHOT would be enough to reproduce. We have a custom kibana config in the e2e-testing repository that could affect.

[EricDavisX]

keep in mind after we get Kibana started we still likely should expect tests to fail, as they were before the overall-Kibana failure: elastic/beats#23693

[EricDavisX]

this pr should fix Kibana and we'll be back to following up on existing bugs on Fleet / Agent / e2e-testing side:
#89541

[EricDavisX]

this is taken care of so I am closing out - Kibana on 8.0 is working.