In SERVER-11002, it was reasoned that QueryAnalysisSampler's onStartup() can potentially race with onShutdown(). If this is true, then it is possible for onShutdown() to be called prior to onStartup() entirely, leading to the resources allocated during onStartup() to never be cleaned up. We should investigate if this prevents graceful shutdown of the server (or is otherwise problematic) and fix it if so.