\documentclass{article}

\usepackage{pgfplots}

\pgfplotsset{compat=1.11, lua debug}

\usepgfplotslibrary{statistics}

\begin{document}

\def\TEST#1{%
\begin{tikzpicture}
	\begin{axis}[y=1cm,axis y line=none,title={#1}]
	\addplot+[boxplot={#1}]
    table[row sep=\\,y index=0] {
    data\\
    1\\ 2\\ 1\\ 5\\ 4\\ 10\\
    7\\ 10\\ 9\\ 8\\ 9\\ 9\\
};
	\end{axis}
\end{tikzpicture}~%
\begin{tikzpicture}
	\pgfplotsset{lua backend}%
	\begin{axis}[y=1cm,axis y line=none,title={#1}]
	\addplot+[boxplot={#1}]
    table[row sep=\\,y index=0] {
    data\\
    1\\ 2\\ 1\\ 5\\ 4\\ 10\\
    7\\ 10\\ 9\\ 8\\ 9\\ 9\\
};
	\end{axis}
\end{tikzpicture}
}

\TEST{estimator=legacy}

%\TEST{estimator=R1}

%\TEST{estimator=R2}

\TEST{estimator=R3}

\TEST{estimator=R4}

\TEST{estimator=R5}

\TEST{estimator=R6}

\TEST{estimator=R7}

\TEST{estimator=R8}

\TEST{estimator=R9}

\end{document}

