It could have several meanings. One would be that a lawsuit is restored to the active docket, meaning list of active cases, after having been dismissed. Or it could mean that a judgment is being re-docketed, meaning it is being re-added to the judgment docket, because the effective date has passed. In many states a judgment is a lien for a certain number of years only. After that time it is no longer a lien, however, the lien can be renewed as a lien by being re-docketed.