From: Murphiroth | #031
Indoctrination won't do a thing to Luke. He's not only come back from the Dark Side, but he also deals with its tempation every single day. And he's got what are probably the strongest mental shields in Force user history.
So far the best response anyone has managed in resistance to indoctrination was to let themselves be able to take control for a minute or so, once. That's Matriarch Benezia, who wouldn't have been indoctrinated fully because it would make her useless. There doesn't seem to be much to fully fight it unless the Reaper is holding the effect back to keep you useful. Although after reading up on it a bit it seems as though the timeframe necessary for indoctrination to take enough effect to matter is way longer than this fight would ever last, so it shouldn't play a factor anyway.
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We clasped our hands, our hands in praise of a conquerors right to tyranny