Searx: [improvement] Add the ability to dynamically exclude search engines that are offline or returning error

[aurora-anon]

That happens many times about a few search engines like The Pirate Bay.

[prolibre]

+1
a dynamic blacklist (for a certain number of hours) of engines in error (for example google !)

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+1
une blacklist dynamique (pour un certain nombre d'heures) des moteurs en erreur (pour exemple google !)

[asciimoo]

This is actually implemented but the duration of the ban is only 5s currently. Every engine has a ban counter which is increased by the ban duration on every error.
Perhaps, we should make the fail ban duration configurable.

[dalf]

I don't know if piratebay wikidata page is updated. If yes something similar to
https://gitlab.com/Flockademic/whereisscihub
Could be used.