use elastic search long/lat

[todo[bot]]

https://github.com/Growstuff/growstuff/blob/6c9a15f95e0694e158eb5b81778982e94545cc86/app/controllers/plantings_controller.rb#L41-L46

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This issue was generated by todo based on a TODO comment in 6c9a15f95e0694e158eb5b81778982e94545cc86 when #2320 was merged. cc @Br3nda.

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