I claim the ornamental design for an motorcycle indicator light, as shown and described.
FIG. 1 is a rotated isometric top view showing my new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a top, front and right-side perspective view thereof;
FIG. 4 is a top, front, and left-side perspective view thereof; and,
FIG. 5 is a rear elevation view thereof.
The broken lines showing an extension of the motorcycle indicator light in FIGS. 1-5 have been shown for the purpose of illustrating environment that forms no part of the claimed design.