Ben Gurion wanted ethnic cleansing of Arabs?

Ben Gurion not only accepted the UN Partition Plan of 1947, but did not take all the land in the 1948 war.

Just before the signing of the Israel-Transjordan armistice agreement, general Yigal Allon proposed to conquer the West Bank up to the Jordan River as the natural, defensible border of the state. Ben-Gurion refused, although he was aware that the IDF was militarily strong enough to carry out the conquest. He feared the reaction of Western powers and wanted to maintain good relations with the United States and not to provoke the British. More, the results of the war were already satisfactory and Israeli leaders had to build a state.

Sources:
Anita Shapira (25 November 2014). Ben-Gurion: Father of Modern Israel. Yale University Press. pp. 173–

https://books.google.com.bo/books?id=2eEdBQAAQBAJ…

Benny Morris (2009). One state, two states: resolving the Israel/Palestine conflict. Yale University Press. p. 79. in March 1949, just before the signing of the Israel-Transjordan armistice agreement, when IDF general Yigal Allon proposed conquering the West Bank, Ben-Gurion turned him down flat. Like most Israelis, Ben-Gurion had given up the dream