When CouchDB is restarted, it checks its
_replicator database and restarts any
replication that is described by a document that either has its
_replication_state field set to
triggered or it doesn't have yet the
_replication_state field set.
Continuous replications always have a
_replication_state field with the value
triggered, therefore they're always
restarted when CouchDB is restarted.