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We report on \textit{NuSTAR} observations of the well-known wind-accretingX-ray pulsar \source\ during a strong spin-up episode that took place inJanuary-March 2019. A high luminosity of the source in a most recentobservation allowed us to detect a positive correlation of the cyclotron lineenergy with luminosity. Beyond that, only minor differences in spectral andtemporal properties of the source during the spin-up, presumably associatedwith the formation of a transient accretion disk, and the normal wind-fed statecould be detected. We finally discuss conditions for the formation of the diskand possible reasons for lack of any appreciable variations in most of theobserved source properties induced by the change of the accretion mechanism,and conclude that the bulk of the observed X-ray emission is still likelypowered by direct accretion from the wind.

NuSTAR observations of the wind-fed X-ray pulsar GX 301--2 during an unusual spin-up event