There was an extension from Teodor some time ago, plantuner, to disable indexes in a session or globally ("set plantuner.forbid_index='id_idx2';") – but it didn't make it to core, and even to contribs. Maybe because the functionality to disable indexes was mixed with planner hints there. It's a very old story, discussion from 2009: https://www.postgresql.org/message-id/flat/47E63672-972E-452...
There was an extension from Teodor some time ago, plantuner, to disable indexes in a session or globally ("set plantuner.forbid_index='id_idx2';") – but it didn't make it to core, and even to contribs. Maybe because the functionality to disable indexes was mixed with planner hints there. It's a very old story, discussion from 2009: https://www.postgresql.org/message-id/flat/47E63672-972E-452...