What is the medium that affects the speed of light in the Fizeau Experiment?

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The Fizeau Experiment
Fizeau measured the speed of light in moving mediums, most notably moving water. Fresnel proposed a "drag coefficient" which putatively described how strongly a moving material medium "dragged" the ether. SR predicts no ether but does predict that the speed of light in a moving medium differs from the speed in the medium at rest, by an amount consistent (to within experimental resolutions) with these experiments and with the Fresnel drag coefficient.
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according to this, light speed is different in a moving medium,
and i think its is relative to the theory of "frame dragging", if
that is correct what is the medium that is in motion?
 

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