Some tests that use the RollbackTest fixture pause index builds and resume them on the rollback node during the kSyncSourceOperationsDuringRollback test phase. During this phase the node may be in rollback and may close client connections so running a command to set a failpoint can fail. We should resume these index builds at a point in the test when we are sure the nodes are not in ROLLBACK state.

This behavior was observed in the following tests:

• jstests/replsets/rollback_waits_for_bgindex_completion.js
• jstests/replsets/primary_rollbacks_before_index_build_received_votes.js.