Intro
I recently had an Ahmadi brag to me on social media in terms of his commitment to Ahmadiyya.  He also mentioned that his Khalifas only ask him to do peaceful things.  I asked him if he knew about how in 1947-48, Mahmud Ahmad, the Ahmadi-Khalifa at that time, he seems to have disregarded the writings of his father (Mirza Ghulam Ahmad), and thus authorized violent Jihad.

The reference work
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My commentary
Dr. Khan tells us in his academic work on Ahmadiyya (see From Sufiism to Ahmadiyya) that in 1947-48, Mahmud Ahmad changed his views on Jihad and totally contradicted Ahmadiyya dogma on the topic. 

Dr. Khan quoted Tarikh-i-Ahmadiyya
He quotes the famous “History of Ahmadiyya” by Dost Muhammad Shahid, vol. 5, page 699