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"a REINDEX operation on an index pg_upgrade'd from a previous release could potentially fail." - Mailing list pgsql-admin

From Ron Johnson
Subject "a REINDEX operation on an index pg_upgrade'd from a previous release could potentially fail."
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Msg-id CANzqJaCk3sN+i9fs=-e_GZtn-wM=+oZU1bb4rpt0KZb31uha=Q@mail.gmail.com
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"
In new btree indexes, the maximum index entry length is reduced by eight bytes, to improve handling of duplicate entries (Peter Geoghegan) §

This means that a REINDEX operation on an index pg_upgrade'd from a previous release could potentially fail.
"

Would a REINDEX CONCURRENTLY mitigate that risk, since https://www.postgresql.org/docs/14/sql-reindex.html#SQL-REINDEX-CONCURRENTLY says "6. The old indexes are dropped"?

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