David Fischer, Google’s VP for Global Online Sales & Operations, is starting a sabbatical at the end of this month and will return in January to work on developing the search giant’s other businesses, including Geo, Local and Check-Out, Business Insider reported. Instead of replacing him, Nikesh Arora, Google’s president of global sales operations and business development, says in a staff memo that he will lead the business. least on an interim basis. The move comes amid a wide exodus of Google (NSDQ: GOOG) ad sales execs over the past several months. A number have followed Tim Armstrong to AOL (NYSE: TWX), including Erin Clift, who departed as Google’s North American director of agency relations in June.