public void enable() {
    if (!isRunning) {
      isRunning = true;
      logger.info("BootstrapSessionManager is enabled.");
    } else {
      logger.warn("BootstrapSessionManager is already enabled.");
    }
  }
Enables the BootstrapSessionManager.
This method should be called before any other operations can be performed.
Idempotent operation as re-enabling the manager if it is already running has no effect.
ambry-store/src/main/java/com/github/ambry/store/BootstrapSessionManager.java