WASHINGTON — Asked earlier this month whether she’d be indicted over her use of a private email server as secretary of state, Hillary Clinton responded, “It’s not going to happen.” Though Republicans characterized her response as hubris, several legal experts interviewed by The Associated Press agreed with the front-runner for the Democratic presidential nomination. The relatively few laws that govern the handling of classified materials were generally written to cover spies, leakers and those who illegally retain such information, such as at home.