FTS and autoindex in a cluster?

In a dovecot replication cluster where both sides have

fts_autoindex=yes

we have a

indexer-worker(user@example.com): Indexed 1 messages in INBOX

on BOTH sides.

a) Is that okay because the duplicated message will be skipped or doesn't harm?

b) Or should "autoindex" only be activated on one side?

Peer

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