  We use Schwinger boson mean field theory (SBMFT) to study the ground state of
the spin-$S$ triangular-lattice Heisenberg model with nearest ($J_1$) and
next-nearest ($J_2$) neighbor antiferromagnetic interactions. Previous work on
the $S=1/2$ model leads us to consider two spin liquid Ans\"{a}tze, one
symmetric and one nematic, which upon spinon condensation give magnetically
ordered states with 120$^{\circ}$ order and collinear stripe order,
respectively. The SBMFT contains the parameter $\kappa$, the expectation value
of the number of bosons per site, which in the exact theory equals $2S$. For
$\kappa=1$ there is a direct, first-order transition between the ordered states
as $J_2/J_1$ increases. Motivated by arguments that in SBMFT, smaller $\kappa$
may be more appropriate for describing the $S=1/2$ case qualitatively, we find
that in a $\kappa$ window around 0.6, a region with the (gapped $Z_2$)
symmetric spin liquid opens up between the ordered states. As a consequence,
the static structure factor has the same peak locations in the spin liquid as
in the 120$^{\circ}$ ordered state, and the phase transitions into the
120$^{\circ}$ and collinear stripe ordered states are continuous and
first-order, respectively.
