private CompletableFuture<Void> apply(ConfigurationEntry entry){
  log.release(entry.getIndex());
  return CompletableFuture.completedFuture(null);
}

private CompletableFuture < Void > apply ( ConfigurationEntry entry ) { log . release ( entry . getIndex ( ) ) ; return CompletableFuture . completedFuture ( null ) ; }
applies a configuration entry to the internal state machine . < p > configuration entries are applied to internal server state when written to the log . thus , no significant logic needs to take place in the handling of configuration entries . we simply release the previous configuration entry since it was overwritten by a more recent committed configuration entry .
