GeoBoundingBox BoundingBox can no longer accept coordinates as params

[niemyjski]

Is your feature request related to a problem? Please describe.

In nest you could do something like this q.GeoBoundingBox( m => m.Field(p => p.Field3).BoundingBox( "51.5032520,-0.1278990", "51.5032520,-0.1278990"))));

Describe the solution you'd like
It's not clear what options you need on the bounding box without really digging into the code and then changing all the arguments.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
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