Better error messaging for failed requests

[mckdemps]

Is your enhancement related to a problem? Please describe.

Describe the solution you'd like

We need to interpret log files for failed requests and instruct the user what meta data needs to be added to the index.

Designs

Describe alternatives you've considered

Additional context

[felipeelia]

Some initial scenarios we can capture:

• post_date_gmt being a text field => It indicates a sync is needed (deleting the index and saving a post should trigger this error)
• sorting on a field that is not indexed

We can start with an array indexed by a regular expression and valued by the message to be displayed. The regex should capture important info and feed it to the message (if it failed due to a meta field, that field should be present in the message)

[felipeelia]

This should now rely on the functionality built in the main plugin (here). Probably some change will be needed there, so we can reuse it here.