code: public CommandResult command(final String command) {
          return command(new BasicDBObject(command, Boolean.TRUE), getReadPreference());
      }
docs: Executes a database command. This method constructs a simple DBObject using {@code command} as the field name and {@code true} as its
  value, and calls {@link DB#command(DBObject, ReadPreference) } with the default read preference for the database.
  
  @param command command to execute
  @return result of command from the database
  @throws MongoException if the command failed
  @mongodb.driver.manual tutorial/use-database-commands Commands