How to filter for a field using lookml_models explore endpoint

I am trying to fetch all the fields using GET /api/3.1/lookml_models/{lookml_model_name}/explores/{explore_name} but the query is hanging on me. ( I tried via the swagger UI from looker UI)

What could be going possible wrong? Also, is there a way to filter for a field in that API endpoint? What is the syntax for it?

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