Unify Elasticsearch error message processing/formatting in SearchSource to provided unified experience across Kibana

[nreese]

Failed search source requests throw an Error. The raw Elasticsearch failure message is available under error.body.message and error.body.attributes.

Different plugins handle displaying the Elasticsearch failure message in different ways. Plugins like Discover have helper methods that format the Elasticsearch error into more friendly messages, for example: https://github.com/elastic/kibana/blob/7.7/src/legacy/core_plugins/kibana/public/discover/np_ready/angular/get_painless_error.ts.

It would be really helpful if SearchSource provided these types of services and unified the processing/formatting of Elasticsearch errors. SearchSource Error object could then be used by SearchSource consumers to provide a common way to expose Elasticsearch error messages to users.

[elasticmachine]

Pinging @elastic/kibana-app-arch (Team:AppArch)

[ppisljar]

Thank you for contributing to this issue, however, we are closing this issue due to inactivity as part of a backlog grooming effort. If you believe this feature/bug should still be considered, please reopen with a comment.