code: @Deprecated
      public WriteResult addUser(final String userName, final char[] password) {
          return addUser(userName, password, false);
      }
docs: Adds or updates a user for this database
  
  <p>Never create or modify users over an insecure network without the use of TLS.</p>
  @param userName the user name
  @param password the password
  @return the result of executing this operation
  @throws MongoException if the operation failed
  @mongodb.driver.manual administration/security-access-control/  Access Control
  @mongodb.driver.manual reference/command/createUser createUser
  @mongodb.driver.manual reference/command/updateUser updateUser
  @deprecated Use {@code DB.command} to call either the createUser or updateUser command