For many area students, the start of summer vacation means an increase in free time and a chance to spend more time with friends. It also means a loss of access to the subsidized school meals that many children depend on. The St. Louis-based nonprofit Operation Food Search aims to fill that gap during the summer months. It plans to serve 100,000 afternoon meals to children for 10 weeks, beginning June 3. That would be an increase of 8,000 from last summer’s total.