Absinthe.Phoenix.Controller.absinthe_pipeline

You're seeing just the callback absinthe_pipeline, go back to Absinthe.Phoenix.Controller module for more information.
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absinthe_pipeline(schema, arg2)

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Specs

absinthe_pipeline(schema :: Absinthe.Schema.t(), Keyword.t()) ::
  Absinthe.Pipeline.t()

Customize the Absinthe processing pipeline.

Only implement this function if you need to change the pipeline used to process documents.