In fsm_workloads/insert_duplicates_unique_index.js there is a race condition between the balancer and the setup state of the workload which tries to create a collection and create an index. The balancer needs to be stopped while the setup state is being executed, as in fsm_workloads/timeseries/insert_ttl_timeseries.js.

These fsm_workloads also create collections or indexes, or shard or unshard collections during setup:

• insert_duplicates_unique_index.js
• list_indexes.js
• crud/indexed_insert/indexed_insert_base.js
• crud/indexed_insert/indexed_insert_text.js
• crud/indexed_insert/indexed_insert_ttl.js
• ddl/collMod/collMod.js
• crud/move_collection_with_crud.js
• crud/indexed_insert/indexed_insert_where.js
• ddl/create_index_background/create_index_background.js
• ddl/create_index_background/create_index_background_unique.js
• ddl/snapshot_read_at_cluster_time_ddl_operations.js
• query/agg/agg_with_chunk_migrations.js
• query/agg/agg_out.js
• query/drop_index_during_lookup.js
• query/drop_index_during_replan.js
• query/findAndModify/findAndModify_remove_queue.js
• query/findAndModify/findAndModify_update.js
• query/map_reduce/map_reduce_with_chunk_migrations.js
• query/update/updateOne_with_sort_update_queue.js

... and many more tests in other fsm states.