  The Gaia-ESO Survey is a public spectroscopic survey that has targeted
$\gtrsim10^5$ stars covering all major components of the Milky Way from the end
of 2011 to 2018, delivering its public final release in May 2022. Unlike other
spectroscopic surveys, Gaia-ESO is the only survey that observed stars across
all spectral types with dedicated, specialised analyses: from O
($T_\mathrm{eff} \sim 30,000-52,000$~K) all the way to K-M ($\gtrsim$3,500~K).
The physics throughout these stellar regimes varies significantly, which has
previously prohibited any detailed comparisons between stars of significantly
different type. In the final data release (internal data release 6) of the
Gaia-ESO Survey, we provide the final database containing a large number of
products such as radial velocities, stellar parameters and elemental
abundances, rotational velocity, and also, e.g., activity and accretion
indicators in young stars and membership probability in star clusters for more
than 114,000 stars. The spectral analysis is coordinated by a number of Working
Groups (WGs) within the Survey, which specialise in the various stellar
samples. Common targets are analysed across WGs to allow for comparisons (and
calibrations) amongst instrumental setups and spectral types. Here we describe
the procedures employed to ensure all Survey results are placed on a common
scale to arrive at a single set of recommended results for all Survey
collaborators to use. We also present some general quality and consistency
checks performed over all Survey results.
