[Discover] Surrounding document views breaks on date nanos with custom formatter

[timroes]

In 7.12 there is a scenario where the surrounding document view in Discover will break with a cryptic ES error:

This happens in the following situation:

• You have an index pattern using a date_nanos field as it's primary timestamp
• That date_nanos fields has a format applied in it's ES mapping, that does NOT include strict_date_optional_time_nanos

Workaround

Either of the following does solve that problem.

• Turn the discover:searchFieldsFromSource advanced setting on. This will read back from _source instead of the fields API, causing e.g. runtime fields not to appear anymore in Discover.
• Make sure strict_date_optional_time_nanos is part of your format option for that date_nanos fields in the ES mapping.

Fix

Blocked on elastic/elasticsearch#69192

Once this is solved we need to make sure we leverage that mechanism in Kibana to not have this error anymore.

[elasticmachine]

Pinging @elastic/kibana-app (Team:KibanaApp)

[timroes]

This has been resolved as of 7.13.0