The ornamental design for a searchlight, as shown and described.
FIG. 1 is a perspective view of a searchlight showing our new design; the heat dissipation ribs provided on the lamp housing are shown in dotted lines and do not form part of the claimed design;
FIG. 2 is a front elevation view of FIG. 1;
FIG. 3 is a back elevation view of FIG. 1;
FIG. 4 is a side elevation view, which are mirror images thereof; of the right and left sides of FIG. 1; the heat dissipation ribs provided on the lamp housing are shown in dotted lines and do not form part of the claimed design;
FIG. 5 is a top plan view of FIG. 1; the heat dissipation ribs provided on the lamp housing are shown in dotted lines and do not form part of the claimed design; and,
FIG. 6 is a bottom plan view of FIG. 1; the bottom surface of the base is shown in dotted lines and is not part of the claimed design.