code: protected void gitMergeNoff(final String branchName)
              throws MojoFailureException, CommandLineException {
          gitMerge(branchName, false, true, false, null, null);
      }
docs: Executes git merge --no-ff.
  
  @param branchName
  Branch name to merge.
  @throws MojoFailureException
  @throws CommandLineException