Querying an index's btree version

[Darren Lafreniere <dlafreniere@xxxxxxxxxxx>]

Hello,

We've read that PG 12 has improved btree index support, and that the latest internal btree version was bumped from 3 to 4. Is it possible to query the btree version that a particular index is using? We'd like to automatically start a concurrent re-index if we detect any btree indexes are still on version 3.

Thank you,

Darren Lafreniere