I am trying to get rid of unused indexes. The index usage is very much depends on the output of pg_stat_user_indexes.idx_scan (correct me if i am wrong). Just wondering what are the impacts of autovacuum or vacuum and auto analyze or analyze on the index usage counters. Will it reset the counters pg_stat_user_indexes.idx_scan to zero every time the autovacuum or vacuum and auto analyze or analyze completed? I am looking at the potential mistakenly removal useful indexes after the usage counters are set to zeros by unknown processes. Is there other process can potentially change the counters apart by calling pg_stat_database, pg_stat_reset_single_table_counters, rebuild index, removal, recreating index, change the column definitions?

I hope some of your smart brains can shine some light on this. Thank ahead.